De Beers says it has identified eight new high-potential kimberlite sites in Angola, according to the Portuguese news agency Lusa.
It resumed explorations in the country in 2022, after a 10-year gap, and signed a memorandum of understanding (MoU) in February with Angola’s National Mineral Resource Agency, and its state-owned mining and trading companies, Endiama and Sodiam.
Aerial surveys by De Beers have so far identified eight sites in Lunda Sul, the northeastern province that is home to the huge Catoca mine. De Beers is now exploring six more areas, together with Endiama.
Angola has yet to explore 60 per cent of its diamond-rich territories. It opened its new Luele diamond mine last November, in a move that is forecast to increase annual production from 9.7m carats in 2023 to 14.6m carats this year.
Under the terms of the MoU there will be a review of kimberlite deposits to be explored and the transparency and traceability of diamond production will be promoted.
The natural diamond industry needs coordinated and consistent marketing campaigns to counter declining demand, says Yoram Dvash, president of the World Federation of Diamond Bourses (WFDB).
In an open letter he calls on every member of the industry to help create a five-year plan, rather than relying on “short-term initiatives when the situation is particularly dire”.
He acknowledges that De Beers and the Natural Diamond Council are both spending millions of dollars on campaigns with leading retailers, but says it’s not enough.
“I am concerned that this is too little and too late,” he says. “To be successful, campaigns need to be coordinated and to be consistent throughout the year.”
He says there hasn’t been a major generic marketing campaign for natural diamonds for almost 20 years, when De Beers halted its “A Diamond is Forever” promotion.
“An entire generation of consumers has come of age without having been exposed to promotional campaigns with positive messages about natural diamonds,” he says in a letter to all the WFDB’s 29 member bourses.
De Beers’ diamond production fell by 25 per cent during the quarter ending 30 September, and could fall even further.
Parent company Anglo American said output for Q3 was 5.6m carats, compared to 7.3m for the same period last year. It reduced production because of challenging market conditions and warned that it would “continue to assess the options to reduce production going forward”.
Anglo also provided an update on plans to sell or demerge its platinum and steelmaking coal assets as part of its “accelerated portfolio simplification” to focus on copper and other more profitable parts of its business, but make no mention of De Beers.
The UK-based company announced in May that it would be seeking a new owner for De Beers, following a bid by mining rival BHP to buy out Anglo.
Duncan Wanblad, chief executive of Anglo American, said: “As previously announced, we reduced rough diamond production from De Beers in response to market conditions.
“The diamond market remains challenging as the midstream continues to hold higher than normal levels of inventory and the expectation remains for a protracted recovery.”
So far this year De Beers has produced 18.9m carats, a 21 per cent drop on YTD 2023.
De Beers says it will, for the first time, disclose the country of its diamonds’ origins – Botswana, Namibia, South Africa, or Canada.
The move is designed to meet growing consumer demand for ethical sourcing and transparency, together with a desire to understand the journey of their particular diamond.
De Beers currently sells its rough output to sightholders in aggregated boxes marked only as DTC (Diamond Trading Company) without indicating the country in which they were mined.
It says it will initially provide data on the country of origin for all diamonds over 1.25 carats that are newly registered on its Tracr traceability platform, and over 1.0 carats from January 2025.
De Beers says advanced algorithmic matching enabled by artificial intelligence now allows it to digitally “disaggregate” diamonds to confirm their specific country of origin.
“For the first time in history, we have the technology to provide our customers with the provenance of their diamonds at scale,” said Al Cook, CEO of De Beers Group.
“We know that our clients care deeply about sustainability and want to understand the good their diamonds have done. Our ambition is to offer them the story of every De Beers-sourced diamond, tracing its journey and positive impact from its origin to its crafting.”
The global supply of natural diamonds has already peaked, according to Moses Madondo, CEO of De Beers Group Managed Operations. Speaking at the Joburg Indaba, a major mining and resources conference in South Africa, he explained that production is on the decline, with several mine closures on the horizon and no significant new discoveries in sight.
Madondo highlighted that this limited supply could push diamond prices higher. “Since the turn of the century, we’ve only seen one major commercial discovery, the Luele mine in Angola, where we aim to start production by the 2030s. But on a broader scale, global diamond production is set to decline,” he said. This trend, while concerning from a supply perspective, offers the potential for price growth.
In the short term, Madondo expects production to dip, but he anticipates a recovery after 2025, driven by the Luele mine ramping up and South Africa’s Venetia mine shifting to underground operations. However, the looming closure of Canada’s Diavik mine in 2026 and the shutdown of several mines in Russia will further tighten supply.
Lightbox has just launched new campaigns for its lab grown diamonds – despite its announcement in June that it was halting production.
The wholly-owned De Beers-owned subsidiary says it has enough existing inventory to keep it going for the time being.
The production facility in Portland, Oregon, USA, is now being used to manufacture industrial diamonds by Element Six, also owned by De Beers.
“Lightbox has sufficient existing inventory from Element Six to meet the brand’s needs for the foreseeable future,” a company spokesperson told IDEX Online.
“At JCK (in June), we communicated that Element Six (our synthetic diamond industrial business which had also been producing LGDs for Lightbox) would suspend production of LGDs for jewellery to focus on high-tech industrial applications.
“However, Lightbox as a brand is continuing as it plays an important role in supporting the differentiation between LGDs and natural diamonds as LGD prices continue to decline and they are increasingly used in fashion jewellery.
“The latest Lightbox campaigns, referenced in the email below, reinforce this as they focus on foregrounding the message of Lightbox’s recently lowered per carat pricing and its fashion-forward approach to product design.
Lightbox says its new Fall campaigns – Shine Bright Spend Less and Modern Family – reflect the brand’s focus on fashion jewelry and accessible pricing.
Melissa Crivillaro, Lightbox’s chief marketing officer, said: “Our accessible prices, our fun and colorful innovations, and our fashion-focused lab-grown diamond jewelry collections underpin Lightbox’s broad appeal.
“As we lean into our next chapter with a revived identity, new creative campaigns and bold price messaging, we look to connect more deeply with our customers.”
Diamond giant De Beers is fully prepared for the expanded G7 restrictions on diamond imports from Russia, which took effect on September 1st. These restrictions now include diamonds weighing 0.5 carats and above, according to Rough&Polished.
De Beers stated that its customers will continue to provide proof of the origin of the diamonds they sell, even as the sanctions now cover rough diamonds weighing 0.5 carats and above, instead of 1 carat and above, as previously stipulated.
The company added that it welcomes the G7’s measures, which stand alongside the diamond industry and diamond-producing nations, aiming to trace the origin of diamonds. “De Beers fully supports the work being carried out by the G7 to prohibit the trade in Russian diamonds, and we are committed to working with the G7, the diamond industry, and our partner governments to ensure there is an effective system put in place,” said De Beers CEO Al Cook.
In a significant move, the world’s largest diamond mining company by value has announced further production cuts, adding to its already implemented plan to curtail output by 10 percent. This decision led to a 15 percent year-on-year decline in second-quarter production, dropping to 6.4 million carats, as reported in an update on Thursday.
The potential sale or listing of De Beers was a crucial component of Anglo’s broader strategy to fend off a £39 billion takeover bid from industry giant BHP earlier this year. However, the ongoing slump in the diamond market poses a challenge to achieving this goal by the end of 2025.
“Trading conditions became more challenging in the second quarter as Chinese consumer demand remained subdued,” stated Duncan Wanblad, Anglo’s chief executive.
High inventories for diamond traders and manufacturers, coupled with expectations of a slow recovery, have prompted the company to consider further production cuts. This strategy aims to manage working capital and preserve cash amid the tough market conditions.
The prospect of deeper production cuts comes as the company disclosed the impact of other setbacks in its second-quarter production update, which had been anticipated by analysts.
Anglo has downgraded its full-year guidance for metallurgical coal from 15-17 million tonnes to 14-15.5 million tonnes following a fire at its Grosvenor mine in Australia, which has been out of action for months. Costs for the coal business are also expected to rise significantly this year, estimated at $130 to $140 per tonne, up from $115 per tonne.
The company is prioritising the sale of its metallurgical coal division due to strong buyer interest, with plans to divest De Beers, its platinum unit, and nickel operations to follow.
Additionally, an impairment on the Woodsmith fertiliser mine in North Yorkshire, UK, is expected in the upcoming half-year results, as spending on the project is drastically cut back as part of the turnaround plan.
Despite these challenges, shares in Anglo rose by 2 percent in early trading in London on Thursday, buoyed by production results for most commodities exceeding consensus analyst forecasts. The company achieved record second-quarter iron ore production in Brazil and is on track to meet its guidance for the copper unit.
Wanblad reaffirmed his commitment to streamlining the company to focus on just copper, iron ore, and fertiliser within 18 months. “We are working at pace to execute on the asset divestments, including steelmaking coal,” he said. “Work is progressing with the aim of substantively completing this transformation by the end of 2025.”
Naturally fluorescing rough diamond parcel from the Gahcho Kué mine. Credit: Mountain Province Diamonds
De Beers Group and Mountain Province Diamonds announced that their joint venture Gahcho Kué diamond mine has surpassed the C$2 billion spending threshold with Northwest Territories and Indigenous business.
The milestone represents 61% of the total C$3.2 billion spent on the project since 2015 when construction began. Local businesses supply welding, transportation logistics, trucking, passenger and cargo flights, labour, and camp catering. The venture has a stated goal of sourcing at least 60% of its requirements for the project from local businesses.
According to the NWT Bureau of Statistics, diamond mining is the largest contributor to the territory’s gross domestic product – C$588 million out of C$4.25 billion in 2023.
Key elements of the economic contribution of the Gahcho Kué mine include:
Gahcho Kué has a tiered contracting structure that gives preference to Indigenous and NWT businesses. Since 2006, C$5.3 billion has been spent with local and Indigenous business in the Northwest Territories and northern Ontario by Gahcho Kué and De Beers Group’s wholly owned Snap Lake (NWT) and Victor (Ontario) mines. (Snap Lake and Victor are now in active closure). In 2023, 69% of the Gahcho Kué mine spend was with NWT and Indigenous companies, totalling C$228 million, the highest amount spent with NWT businesses since construction. In 2023, C$90 million was spent with companies operated by the mine’s impact benefit agreement (IBA) communities. From 2006 to 2023, Gahcho Kué and Snap Lake mines have contributed a combined C$26.5 million in social investment within the NWT. Gahcho Kué has also made significant payments to Indigenous communities in terms of six IBAs and has paid resource royalties to the government of the NWT. Gahcho Kué was officially opened in 2016 and now provides 663 full-time equivalent jobs, including 245 jobs held by NWT residents.
The mine is located about 280 km northeast of Yellowknife, NWT, on the traditional territories of Tlicho, Dene and Metis peoples. De Beers is the 51% owner and operator. Mountain Province retains the remaining 49%.
In 2023 the project mined 3.3 million tonnes of kimberlite and recovered nearly 5.6 million carats (on a 100% basis). Guidance for 2024 is 4.2 million to 4.7 million carats.
Bruce Cleaver, former CEO at De Beers Group, has been appointed chair and independent non-executive director of Gemfields, the UK-based emerald and ruby miner.
He said the company, founded in 2005, was bringing sophistication to a fragmented and informal colored gemstone industry, much as De Beers did more than a century ago for diamonds.
Cleaver, 59, (pictured) served as De Beers CEO from 2016 until his resignation in February 2023, during which time the company launched its Lightbox range of lab growns and extended its diamond mining agreement with the Botswana government for a further 10 years.
“The parallels with De Beers’ origins and how consistent and reliable supply can deliver remarkable industry growth and positive contributions to communities, are clear to all,” he said.
“The coloured gemstone market has long transcended the arrival of their lab-grown counterparts, with lab-grown rubies having been around for more than 120 years.”
Gemfields operates the Kagem emerald mine and Montepuez, the world’s largest ruby mine, in Mozambique. It holds a 75 per cent stake in both.
Construction of a new processing plant at Montepuez, which will triple its throughput capacity, is due to complete in the first half of 2025.”
Gemfields reported near-record revenues of $262m for FY2023.
Cleaver will replace Martin Tolcher as chair, and Lumkile Mondi who was lead independent non-executive director, effective 1 July.
De Beers has launched an ambitious five-year plan to become the premier jewelry brand worldwide, Diamond World reports.
CEO Al Cook aims to expand De Beers’ retail presence to compete with luxury giants like Tiffany and Cartier. Cook envisions transforming De Beers from a mining-focused company into a leading jewelry house, capitalizing on its rich legacy and market influence.
In an interview with the Financial Times, Cook said: “Diamonds’ future extends far beyond mining. I’m thrilled by the potential to execute our comprehensive strategy, aspiring to establish the world’s most prestigious jewelry maison—a vision that transcends traditional mining company boundaries.”
Central to this transformation is De Beers’ “Origins” strategy, which seeks to drive demand for mined diamonds by appealing to a new generation of consumers. This includes revitalizing marketing efforts and using innovative techniques to enhance the brand’s reach.
A key part of De Beers’ strategy is strengthening relationships with retail partners. Future plans include forming strategic alliances with major retailers, such as Signet Jewelers in the United States and Chow Tai Fook in China.
De Beers Group announced late last week that it will be suspending production of diamonds for jewelry at its Lightbox factory in Gresham, Oregon, pivoting instead to industrial diamonds for technology applications.
The company made the announcement Friday, in the midst of the Las Vegas jewelry trade shows.
The lab-grown pivot is part of a broader new strategy called “Origins,” which is designed to grow desire for natural diamonds while cutting costs.
In an interview with National Jeweler on Friday, De Beers CEO Al Cook elaborated on the decision, including on the future of Lightbox, the lab-grown diamond jewelry brand De Beers launched six years ago.
“Element Six used to produce diamonds because they were hard and they could be used industrially,” he said. “Now, with the price of synthetic diamonds coming down, it opens up this amazing set of technological activities. We’re in partnership with … a number of high-tech companies looking at how you use diamonds as components in the digital era.
“That bit for us is really exciting. And that’s where the future of synthetic diamonds lies for us.”
Despite the transition at the factory, Cook said Lightbox will continue as a brand, drawing upon existing stock for the immediate future.
“At the moment, we’ve got a lot of stones available to Lightbox. Production will continue for a few months to ensure that they’ve got a stock of beautiful lab-grown diamond stones they can sell.”
After Lightbox depletes its existing stock, “we’ll see where the brand goes and we’ll see what happens,” Cook said. “I think it’s too early to say.”
De Beers announced the launch of the Lightbox lab-grown diamond brand during the Las Vegas shows in 2018.
At first, De Beers was growing the diamonds for Lightbox at its Element Six facility in the United Kingdom.
In October 2020, it opened its $94 million Lightbox factory in Gresham, a Portland suburb.
In an attempt to control the direction of the lab-grown diamond market, De Beers set an $800/carat price structure for the line.
It also marketed Lightbox as jewelry for less-special special occasions, like Sweet 16s or graduations, not milestones like engagements or anniversaries, which, it posits, should be celebrated with natural diamonds.
Since the line’s launch six years ago, lab-grown diamond prices have dropped precipitously. Lightbox cut its prices by as much as 40 percent last month.
Cook said De Beers expects the trend to continue.
“For a lot of retailers out there, the incentive to sell natural [diamonds] and the incentive to sell lab-grown are reversed. There was a period of time, a year-plus ago, when retailers got more of a margin sometimes from selling lab-grown diamonds.
“They were cheap to manufacture, and they could be sold as near-equivalents to natural diamonds. We didn’t do that in De Beers Group. We made very clear through Lightbox that these were two entirely different propositions,” he said.
“Not everyone followed our approach. It is now very clear that for all the retailers I can speak to here at JCK, the margin you get by selling a natural diamond is far greater than the margin that you get by selling a lab-grown diamond. It’s also clear that the gap is going to grow rather than shrink. We expect the price of lab-grown diamonds to go down and down, to continue collapsing.”
As it transitions production at the Lightbox factory in Gresham, De Beers announced Friday that it also will be consolidating its Element Six chemical vapor deposition (CVD) diamond-growing facilities, going from three factories to the one factory in Oregon.
Anglo American, the $30.7 billion British multinational mining company, just announced plans to divest De Beers, its diamond mining and jewelry subsidiary. Ango American holds an 85% interest in De Beers and the government of Botswana owns the minority share.
“Anglo American is now exploring the full range of options to separate the business in order to set it up for success in unlocking full value, “ Anglo American CEO Duncan Wanblad said in a presentation earlier this week. “This will give both Anglo American and De Beers a new level of strategic flexibility to maximize value for both company’s shareholders.”
Anglo American is fighting a takeover bid from BHP Group, reported by Reuters to be the world’s largest mining company. In a move to shore up the company’s overall value, Anglo American will focus on its cooper, premium iron ore and crop nutrients businesses. Also slated to be divested is its Anglo American Platinum business, both of which will bring profound changes to the roughly $300 billion global jewelry industry.
Advising that Anglo American is considering a number of options for De Beers, be it a sale or IPO, and that it is still working through logistics with Botswana, Wanblad said, “It is a great business and it has fantastic assets and it has an exceptional brands. And therefore on that basis, it really deserves to be together on that set of criteria. How we do this is going to be a journey.”
De Beers CEO Al Cook is more than ready for the next phase of that journey. “For 124 of our 136 years of existence, Anglo American didn’t own the majority of De Beers,” he shared in an exclusive interview from Botswana. Anglo American acquired its majority stake in 2011.
As part of efforts to provide increased provenance across the diamond industry, De Beers plans to bring the first non-De Beers Group goods onto its Tracr platform this year.
The Tracr platform uses blockchain, AI, the Internet of Things and advanced security and privacy technology to track a diamond’s journey from where it is mined and throughout the value chain, providing consumers tamper-proof assurance of where the diamond comes from.
“Our leadership in diamond transparency and traceability continued throughout 2023, underpinned by leading technologies, so that we can increasingly connect consumers with the provenance of their natural diamond and all the benefits it has delivered along its journey,” De Beers CEO Al Cook says in an update to shareholders on the group’s ‘Building Forever’ sustainability goals.
In its ‘Building Forever 2023 Sustainability Report’, published on May 8, De Beers reflects on the sustainability goals it has achieved.
This includes having engaged 5 000 women and girls in science, technology, engineering and mathematics – two years ahead of schedule.
Further, De Beers has agreed to establish a flagship Diamonds for Development Fund, in Botswana; progress key renewable energy projects in support of its emission reduction targets; and scale the development of Tracr.
De Beers reports that it is now registering more than two-thirds of its global production by value on the platform, with 1.5-million individual diamonds registered on the platform during 2023, bringing the total registered on Tracr to two million.
De Beers also opened up the platform to the wider industry, with a number of prominent marketplaces and laboratories, including the Gemological Institute of America and Gemological Science International having joined the platform.
Further, De Beers announced a collaboration with diamond traceability technology company Sarine to focus on recording technologically assured, rough-to-polished diamond traceability, without the need for further physical verification, the diamond miner notes in its sustainability report.
“Tracr and Sarine technology is open to users across the industry and will focus on making digital access to information on diamonds available to Group of 7 officials,” the report states.
In addition, De Beers also launched a “substantially uplifted” Pipeline Integrity (PI) standard, that includes higher expectations and a new melee supplement. The PI standard sets the key criteria for demonstrating segregation and traceability of eligible diamonds from non-eligible diamonds.
“It assesses each entity in the chain of custody, from the point of rough purchase through to the polished sorting office, to help ensure the management systems, policies and procedures are in place to segregate and reconcile eligible diamonds from non-eligible diamonds,” De Beers explains.
In 2023, the group expanded the scope of participants in the PI programme to Tracr participants involved in the handling or the manufacturing process who register polished eligible diamonds on the platform.
This expansion in scope resulted in a 16% increase in the number of entities required to participate in PI, compared with 2022.
Each entity participating in the PI programme must conduct an annual self-assessment and undergo a third-party assessment by SGS – De Beers’ chosen external verifier.
Meanwhile, De Beers is also progressing renewable-energy projects at its operations as part of its emissions reduction efforts.
“We continue our efforts to reduce our carbon footprint in line with our recently validated science-based emission reduction targets and are progressing investments in renewable energy to power our operations,” Cook says.
De Beers has entered into an agreement with Envusa Energy – a joint venture between its parent company Anglo American and EDF Renewables – to wheel 48 MW of wind and solar generated electricity to the Venetia mine, in Limpopo, South Africa, from 2025.
The diamond miner has also completed a prefeasibility study into a 50 MW on-site solar plant to be built at Venetia. A feasibility study into the project is under way and expected to be completed by mid-2025.
Further, De Beers has progressed plans for the development of a 34 MW wind farm at subsidiary Namdeb’s land-based operations, in Namibia. A feasibility study is under way.
In Botswana, Debswana is exploring renewable energy supply options to be developed in partnership with the Botswana Power Corporation or independent power producers.
It also held an inaugural Scope 3 supplier summit, mandating carbon reporting for the company’s sightholders and securing commitments with key suppliers to work on aligned greenhouse gas (GHG) reduction roadmaps.
De Beers has set a target of achieving a 42% decrease in its absolute Scope 1 and Scope 2 GHG emissions, as well as a 25% decrease in its absolute Scope 3 GHG emissions by 2030, with 2021 set as the baseline year.
A diamond held by dop is polished on rotating automatic cast iron lap
Prices showed signs of stabilizing during April, with an even mix of increases and decreases in many sizes, especially fancy cuts. Overall there were more clusters of price rises than we have seen of late.
It’s too early to positively identify a clear upward trend, but the “end of the lab grown boom” is arguably having an impact. Lab grown prices are now so low – in some case just 10 per cent of natural – that many jewelers are opting not to stock them in inventory and are only buying them on consignment.
In addition the G7 sanctions, in place since 1 March, are now starting to bite, and to slowly push up prices.
They have effectively restored the De Beers monopoly, although its rough production is down by almost a quarter so far this year (as is Rio Tinto’s) and rough sales remain sluggish (down 18 per cent on last year). Meanwhile polished exports from India fell by 27 per cent during March to $1.2bn
De Beers is moving its auctions headquarters from Singapore to Botswana in a move designed to streamline its operations and cut costs.
The UK-based miner sells around 10 per cent of its rough, by value, via online auctions to almost 1,000 registered buyers. The other 90 per cent is sold to sightholders.
In a statement the company said De Beers Group Auctions would pause it operations and sales events in the coming months, while the transition takes place.
Last year De Beers postponed its Cycle 5 and 6 auctions amid dwindling demand from Indian manufacturers and in January it introduced a new online “sealed bid” tender called The Offer for some of its rough diamonds.
Al Cook, De Beers Group CEO, said the move would drive cost efficiencies and support the needs of customers.
Last December Anglo American, parent company of De Beers said the diamond miner would have to cut $100m from its annual overheads in the face of ongoing weak demand.
De Beers moved its Sights from the UK to Gaborone, Botswana, in 2013.
Diamond output for De Beers slumped 23 per cent in the first quarter, as production was cut in response to a slow recovery in demand amid a pullback in luxury spending and the proliferation of lab-grown equivalents.
De Beers was the only unit of Anglo American to adjust its full-year production forecast on Tuesday, reducing its guided range to 26mn to 29mn carats of output, from 29mn to 32mn, and lifting expected average costs to $90 per carat, from $80.
Anglo American said the diamond market was suffering from a price rout caused by excess piles of inventory, something that De Beers has previously acknowledged is partly down to lab-grown diamonds cannibalising demand for mined stones.
“Ongoing uncertainty around economic growth prospects has led to a continued cautious purchasing approach” by its customers, Anglo American said. “The recovery in rough diamond demand is expected to be gradual through the rest of the year,” it added.
De Beers said a nascent recovery had begun in the first quarter, buoyed by improved demand for diamond jewellery around Christmas and new year in the US.
Diamond producers including De Beers’ arch-rival, Russia’s Alrosa, tried to curb the flow of gemstones into the market in the second half of last year. The Indian government even put on a voluntary import moratorium on rough stones in the final quarter to protect its polishers and cutters.
Despite those continued efforts into this year, demand, prices and the market recovery remains sluggish, Anglo said, requiring further action to be taken to reduce supply.
Anglo American chief executive Duncan Wanblad has been under pressure to improve performance since a production downgrade in December sent shares tumbling, although it has been aided by higher commodity prices, especially for copper.
Wanblad has said that “nothing is off the table” when it comes to asset sales or other options to restructure units, of which De Beers and the platinum group metals division are the most troubled.
“We are progressing through our asset review to optimise value by simplifying and improving the overall quality of the portfolio,” he said in a statement in the first-quarter production update on Tuesday.
Shares in Anglo American dropped 1.7 per cent in early trading in London and remain about a third lower than they were at the start of 2023.
Besides diamonds, the London-based company managed to maintain its guidance across its other commodities such as copper, iron ore and steelmaking coal.
Copper output jumped 11 per cent to 198,100 tonnes, helped by record throughput at its Quellaveco mine in Peru and higher grades at its Chilean mines Collahuasi and El Soldado.
South Africa, where Anglo American has iron ore, steelmaking coal and platinum mines, has become an increasing drag on production because of crippling problems in the logistics and power sector. Rail constraints resulted in a 2 per cent drop in output at Kumba Iron Ore.
It’s 50 years since the world’s largest octahedral diamond was recovered, and even today it remains uncut, unpolished and unsold.
The 616-carat Type 1 yellow diamond, dates back to 17 April 1974 and comes from the Dutoitspan Mine in Kimberley, South Africa, which opened in the 1870s and closed in 2005.
The miner who found the diamond, De Beers employee Abel Maretela, was rewarded with a large bonus and a house.
Al Cook, De Beers Group CEO, was shown the diamond on a visit to Johannesburg, by Moses Madondo, CEO of De Beers Group managed operations.
“I’m a geologist so I love to learn about the history of diamonds even before they were found,” he said in a LinkedIn post.
“This is a Type 1 diamond which means that it was formed around 150 km below the earth’s surface, deep in the mantle, over 1 billion years ago.
“During the Cretaceous period, about 100 million years ago, a kimberlite volcano brought this diamond up to the earth’s surface. Its beautiful yellow colour comes from nitrogen atoms that were trapped inside the carbon lattice when it was forming in the mantle.”
Geologists from ETH Zurich and the University of Melbourne have established a link between diamond occurrence and the mineral olivine.
In a paper published in the journal Nature Communications, the scientists explain that their method will simplify the detection of diamond deposits. The process relies on the chemical composition of kimberlites, which occur only on very old continental blocks that have remained geologically unchanged for billions of years, predominantly in Canada, South America, central and southern Africa, Australia and Siberia.
According to the study’s lead author, Andrea Giuliani, olivine is a mineral that makes up around half of kimberlite rock and consists of varying proportions of magnesium and iron. The more iron olivine contains, the less magnesium it has and vice versa.
“In rock samples where the olivine was very rich in iron, there were no diamonds or only very few,” Giuliani, who has been studying the formation and occurrence of the gemstones since 2015, said in a media statement. “We started to collect more samples and data, and we always got the same result.”
His investigations ultimately confirmed that olivine’s iron-to-magnesium ratio is directly related to the diamond content of the kimberlite. Giuliani and his team took these findings back to De Beers, who had provided them with the kimberlite samples. The company was interested and provided the scientific study with financial support and asked the researchers not to publish the results for the time being.
A slow, repetitive process In 2019, Giuliani moved from Melbourne to ETH Zurich and, supported by the Swiss National Science Foundation, began to look for explanations for the connection between olivine’s magnesium and iron content and the presence of diamonds.
With his new colleagues, he examined how the process of metasomatism, which takes place in the earth’s interior, affects diamonds. In metasomatism, hot liquids and melts attack the rock. The minerals present in the rock react with the substances dissolved in the fluids to form other minerals.
The geologists analyzed kimberlite samples that contained olivines with a high iron content—and hence no diamonds. They discovered that olivine becomes richer in iron in the places where melt penetrates the lithospheric mantle and changes the composition of mantle rocks significantly. And it is precisely in this layer, at a depth of around 150 kilometres, that diamonds are present.
The infiltration of the melt that makes olivine richer in iron destroys diamonds. If, on the other hand, no or only a small amount of melt from underlying layers penetrates the lithospheric mantle and thus no metasomatism takes place, the olivine contains more magnesium—and the diamonds are preserved.
“Our study shows that diamonds remain intact only when kimberlites entrain mantle fragments on their way up that haven’t extensively interacted with previous melt,” Giuliani said.
A key point is that kimberlites don’t normally reach the earth’s surface in one go. Rather, they begin to rise as a liquid mass, pick up fragments of the mantle on the way, cool down and then get stuck. In the next wave, more melt swells up from the depths, entrains components of the cooled mantle, rises higher, cools, and gets stuck. This process can happen multiple times.
“It’s a real stop-and-go process of melting, ascent and solidification. And that has a destructive effect on diamonds,” Giuliani noted. If, on the other hand, conditions prevail that allow kimberlites to rise directly to the surface, then this is ideal for the preservation of the gemstones.
De Beers is already using olivine analysis Olivine analysis is as reliable as previous prospecting methods, which are mainly based on the minerals clinopyroxene and garnet. However, the new method is easier and faster: it takes only a few analyses to get an idea of whether a given kimberlite field has diamonds or not.
“The great thing about this new method is not only that it’s simpler, but also that it finally allows us to understand why the previous methods worked,” Giuliani said. “De Beers is already using this new method.”
De Beers has introduced a new online “sealed bid” tender for some of its rough diamonds.
The Offer, which went live last week, allows buyers to key in the price they’re prepared to pay for a lot, unseen by other bidders.
It is an additional sales channel rather than a replacement for the online auctions that have been taking place since 2008.
Online auctions have accounted for the 10 per cent of De Beers production that is not sold at Sights.
“We are constantly looking at new ways for customers to source natural diamond supply with a view to make the experience as simple and flexible as possible while keeping commerciality in mind,” said Rhyzard Bilimoria, account director in De Beers Group Diamond Trading.
“We believe that for certain product ranges and during certain industry conditions, the Offer represents the most effective channel to meet customer and industry needs.”
He said the Offer was quick, simple, confidential and allowed buyers to bid any amount.
“We recognise that in periods when trading conditions are evolving, different customers can perceive different value depending on their specific activities – it is therefore beneficial to implement a sales process where there is no visibility of other bidders’ activity, as this supports customers’ ability to make independent assessments of value that reflect their own underlying demand.”
De Beers cancelled its online auctions in the last two sales cycles of 2023 amid slow demand.
