A remarkable two-coloured natural diamond has been discovered in Botswana, astonishing experts with its size and formation. The gem half pink and half colourless weighs an impressive 37.41 carats and measures approximately 24.3 x 16 x 14.5 millimetres, according to the Gemological Institute of America (GIA).
The GIA describes the stone as having formed in two distinct geological stages. Sally Eaton-Magaña, Senior Manager of Diamond Identification at the GIA, explained that the pink section likely began as colourless before undergoing plastic deformation possibly caused by a mountain-forming event millions of years ago. This natural deformation altered the crystal lattice, giving rise to the diamond’s vivid pink hue. The colourless section, in contrast, appears to have formed later under more stable conditions.
Pink diamonds are among the rarest gems on Earth, prized for their beauty and scientific intrigue. Unlike coloured diamonds that owe their hue to trace elements or radiation exposure, pink diamonds result from structural distortions within the crystal lattice. This phenomenon must occur under highly specific pressure and temperature conditions too little deformation and the diamond remains colourless; too much and it turns brown.
“It’s a geological balancing act like Goldilocks,” noted Curtin University geologist Luc Doucet, referencing the fine threshold that determines a diamond’s colour outcome.
What makes this new discovery even more extraordinary is its size. While other bi-coloured diamonds have been documented, they are typically no larger than 2 carats. The 37.4-carat specimen from Botswana represents a significant leap in both scale and scientific importance.
The diamond was unearthed at Lucara Diamond Corporation’s Karowe mine, one of the world’s most productive sources of exceptional diamonds. The Karowe mine has previously yielded some of the most celebrated finds in modern history, including the 2,488-carat “Motswedi” diamond, the second-largest rough diamond ever recovered, and the 62-carat “Boitumelo” pink diamond.
This latest discovery further cements Botswana’s position at the forefront of the global diamond industry and provides scientists with another remarkable glimpse into the complex natural processes that create the Earth’s most coveted gemstones.
Vibrant 0.45-carat gem adds final flourish to Diavik’s closing years. Just when it seemed Diavik had given all it could give, a rare purple diamond has been unearthed at the Northern Canadian mine – a 0.45-carat stone that stands out in a region better known for producing predominantly colorless gems and the occasional yellow stone, adding a splash of unexpected color as the operation approaches the final years of its mine life.
The discovery, quietly announced by Rio Tinto via social media, comes just weeks after the recovery of a 158.2-carat yellow diamond and a 50-million-year-old petrified log – both of which drew attention to the remarkable geological and historical treasures still surfacing from the remote subarctic site.
“We recently had a unique discovery at Diavik – a rare purple diamond weighing in at 0.45 carats,” the company wrote in a social media post on LinkedIn.
“Diavik diamonds are typically white, so this came as a pleasant surprise,” the post continued. “The purple colour likely comes from a trace element such as hydrogen or a twist in the crystal lattice structure of the diamond. The shape of the rough diamond is known as a ‘makeable’ which means it will likely be cut into a single diamond.”
Though small in size, the stone is striking for its rarity, with colored diamonds of any kind making up less than 1% of Diavik’s total production over more than two decades of operation.
Among them, purple diamonds are the rarest, their distinctive hue typically attributed to hydrogen impurities or plastic deformation deep in the Earth’s mantle – a result of the intense pressure and heat that alters the crystal structure during formation.
In gemological terms, purple diamonds are often classified under the broader category of “fancy color” stones, though few attain the deep saturation necessary for that label. More often, their shades fall within the purplish-pink or violet spectrum, with pure purple standing as one of the most elusive colors in the diamond world.
For Diavik, the recovery of such a specimen near the end of its mine life serves as both a scientific curiosity and a symbolic capstone.
Since beginning production in 2003, the mine has yielded over 140 million carats of rough diamonds – predominantly colorless, with a handful of exceptional yellow stones including the 552-carat “egg” discovered in 2018 and the more recent 158.2-carat find earlier this year.
Yet, while the occasional yellow diamond has offered moments of brilliance, the purple discovery stands out for its singularity.
While not the first purple diamond recovered from Diavik – industry veterans have noted smaller specimens dating back more than a decade – this 0.45-carat stone ranks among the most notable, particularly for its size, clarity, and timing near the end of the mine’s operational life.
Purple diamonds are so rare that only a few notable examples have surfaced globally, often fetching premium prices far beyond their white or even pink counterparts. Their appearance in the trade is sporadic, and their origin even more geographically restricted – making a Canadian purple diamond an especially uncommon occurrence.
Diavik’s purple gem is expected to be cut into a single polished stone, though no details have been released about where it might end up – in private hands, a high-profile auction, or perhaps a Canadian institution.
Whatever its path, the find adds a final chapter to Diavik’s legacy – a small but vibrant reminder that even in its twilight, the remote Arctic mine remains full of surprises.
An agreement has been entered into for the outright sale of Williamson Diamonds Limited, Petra Diamonds announced on Wednesday.
The London-listed and South Africa-active Petra is taking steps to sell its entire shareholding in the Tanzanian entity to Pink Diamonds Investments for a headline consideration of up to $16-million.
This follows Petra’s sale in May of just under half of the asset, in which the Tanzanian government has a stake, for $15-million via long-term technical services contractor Taifa Mining.
Since then, Williamson’s coming under consolidated ownership has emerged increasingly as the preferred way forward.
As a Taifa affiliate, Pink Diamonds is viewed by Petra CEO Richard Duffy as possessing the technical and financial capability to conduct operations in a responsible manner for all stakeholders.
As a wholly Tanzanian-owned company with more than three decades of mining-related experience, Taifa’s working relationships extend to mining majors such as De Beers, Barrick and AngloGold Ashanti. It is now entering a phase of exclusive ownership of the asset where about 1 100 people are employed, most of them Tanzanian.
The mine’s reserves and resources as of June 30 were reported as 37.17-million carats. With liquidity challenges continuing, further capital investment will be required.
“We look forward to working closely with the Mining Commission, the Fair Competition Commission, employees, community representatives and other key stakeholders in completing the sale as soon as possible,” Duffy stated in a stock exchange announcement accessed by Mining Weekly.
In South Africa, Petra operates the Cullinan diamond mine in Gauteng and the Finsch diamond mine in the Northern Cape.
“We’re committed to adopting and adhering to the latest internationally recognised standards throughout all aspects of our business,” said Pink Diamonds chairperson Rostam Azizi, whose family are from the area around Mwadui, the other name for the Williamson mine, which is situated 23 km north-east of Shinyanga in northern Tanzania.
Mining Weekly can report that the discovery of the kimberlite pipe by Canadian geologist John Williamson in 1940 led to ongoing operation since then, making it one of the world’s oldest continuous operating diamond mines. Its yield of 19-million-plus diamond carats includes the 54.5 ct Williamson pink diamond presented to British royalty in 1947.
Congratulations are in order for Gordon Ramsay’s daughter, Holly, and her partner Adam Peaty.
The couple announced the news of their engagement on Thursday, Sept. 12, with an Instagram post filled with romantic couple’s photos and close-ups of Holly’s unique ring.
Peaty, a 29 year old swimmer and Olympic gold medalist, worked with Pragnell on the rock, which boasts a large yellow diamond on a gold band. On his Instagram Stories, the athlete revealed the ring took 10 months to come together.
“I trusted you with my vision and you delivered,” he wrote over a picture of Holly wearing the sparkler. “It’s perfect.”
In the carousel of snapshots, Holly wore a white bikini top and baby pink manicure, which complemented the colorful gemstone.
Proud dad Gordon, 57, shared well wishes to his 24 year old on Instagram.
“Congratulations to this gorgeous girl hollyramsayy. So happy for you and adam_peaty ! Hols, watching you become the woman you are today with your kindness and your love is absolutely infectious. Adam is a very lucky man! Welcome to the family,” he wrote.
Holly and Peaty became Instagram official on July 10, 2023, and in her engagement post on Instagram, she expressed how excited she is to wed her “best friend.”
“I truly cannot put into words how I am feeling right now. I still remember how big my smile was the morning I got home from my first date with you,” she wrote.
“Thank you for letting the little girl inside of me feel loved, seen and happier than ever. I love you & I cannot wait to be your wife.”
A “Toi et Moi” ring featuring blue and pink diamonds – both over 5.0-cts – sold for $3.7m (£3m) almost double its high estimate, at Bonhams London.
The ring was crafted and signed by Mouawad, the Geneva-based jeweler to royalty and high society, which was founded in 1890. It carried a pre-sale estimate of $1.3m to $1.9m (£1m to £1.5m).
The radiant-cut fancy intense blue diamond, weighing 5.03 carats, is obliquely-set with a radiant-cut fancy purple-pink diamond, weighing 5.13 carats. The gallery and shoulders are pave-set with brilliant-cut diamonds of pink and blue tint.
The 113-lot sale, on 13 June, made a total of £6,590,562, with 78 per cent sold by lot and 99 per cent sold by value.
Christie’s will offer “The Eden Rose,” a 10.20-carat round brilliant fancy intense pink diamond, as the top lot of its New York Magnificent Jewels auction on June 11. Its estimate is $9 million to $12 million. It is the first time this diamond has appeared at auction.
The Gemological Institute of America report supplied by Christie’s states that the diamond is also internally flawless.
Describing it as an “exceptionally rare gemstone,” Christie’s says the gem, named after the symbol for unconditional love, it is the most significant round brilliant internally flawless fancy intense pink diamond to be offered at auction since the “Martian Pink,” which sold at Christie’s Hong Kong in 2012 for $17.4 million, equating to $1.45 million per carat.
The diamond exhibits a pure pink hue, unlike many natural pink diamonds that typically display secondary hues such as purple, orange or gray. “The Eden Rose stands out for its complete absence of any secondary color, rendering it exceptionally rare,” Christie’s said in a statement.
Rahul Kadakia, Christie’s International head of Jewelry, said in a statement that he is “anticipating significant interest from around the world.”
Christie’s says the round brilliant cut is known for its ability to maximize light reflection and is considered the ideal cut for diamonds.
The Eden Rose is mounted on a ring further adorned with eight brilliant-cut diamonds, ranging in weight from 3.11 to 0.73 carats, and two marquise brilliant-cut diamonds of 2.24 and 1.02 carats.
Behind his small and grandfatherly stature is a man who’s not afraid to say anything, and usually does. Leibish Polnauer has been in the diamond industry for over 40 years and runs an extremely successful business. But if not for a crazy fluke and a bit of luck, that business wouldn’t exist.
Polnauer — affectionately known in the trade as simply “Leibish” — welcomed Rapaport’s editorial team to his office in Israel’s diamond bourse to talk about how he got his start, the market for colored diamonds, what he thinks of lab-grown, and how the industry has changed over the years. We also got a sneak peek at some of the jewelry pieces his company is currently working on.
The train ride epiphany Around 1980, after several years as a diamond polisher and the loss of his job at a factory that went out of business, Polnauer went to London to try to sell a parcel of diamonds. He didn’t manage to offload a single stone, but on the train, on the way back from his business meetings, he saw an advertisement in The Guardian for crown jeweler Garrard, featuring a pear-shaped, brown diamond. Using his abundance of “Israeli chutzpah,” he called the number and told them he had diamonds to sell. The managing director invited him to his office on Regent Street, where he told Polnauer he was making a tiara for a wedding and needed 106 pear-shaped diamonds in four weeks.
Despite his cheeky admission to our team that at the time he had never even heard of pear-shaped diamonds, Polnauer took on the challenge, flew to New York, and secured the stones needed for the piece. He brought them back to London, and Garrard, thrilled with the selection, cut him his first check for GBP 106,000, equivalent to about GBP 1 million ($1.3 million) today.
He used that experience to convince Graff to do business with him. At the time, the jewelry house worked with a sultan whose wife gifted every visitor to their palace with a diamond watch, and Graff was desperate for the pink and yellow diamonds needed to create 50 to 70 watches per year. And thus began Polnauer’s career in the colored-diamond business.
Changing with the times Throughout the years, Polnauer has watched his business grow from diamond sourcing and manufacturing to include in-house designers that create custom pieces for clients whom they usually never meet face-to-face, but who nevertheless aren’t afraid to drop massive sums of money for a beautiful, original Leibish creation.
One of the most important lessons Polnauer has learned during his time in the colored-diamond industry is that people shop first by color, then by price tag. He has broadened his business to include colored gemstones, because if someone wants a blue diamond but can’t afford it, a sapphire or tanzanite can often present a compelling and cheaper alternative.
Most of the firm’s clients are wealthy 30- to 60-year-olds who have a penchant for color, because, as Polnauer notes, “color is excitement.” They purchase multiple pieces to match their clothing. One client in Texas bought 13 rings in a two-year period because she loved color. Meanwhile, another client ordered a ring for his wife, who then decided she needed earrings to match. When those were ready, she wanted a necklace to complete the set. Polnauer was more than happy to comply, and in a four-day time span, he saw his bank account padded with an additional $500,000.
But working in the colored-diamond industry isn’t always easy. Recently, the company was tasked with sourcing dozens of matching yellow diamonds to be used for a watch created by Jacob & Co. That search took the company on a two-year, international hunt before they finally filled the commission.
Other changes over his more than four-decade career have also been difficult. He has sadly watched as the Israeli diamond-manufacturing sector has diminished in importance with India’s growth, and learned the meaning of providing added value to customers.
“People used to just want to buy a stone, but now they want to buy a product,” he says. “You have to have an internet business; you have to manufacture jewelry. You also have to really be on point with your presentation. When business was face-to-face, if you screwed someone, he would just walk away upset. Now, with the internet, he doesn’t walk away. If he doesn’t like what he gets, he sends it back, and he writes a bad report about you on Google, and you have to pay for the return shipment, so presentation is crucial.”
No lab-grown zone While many in the industry have welcomed the advent of lab-grown as a way to make money from clients who can’t always afford natural stones, Polnauer pulls no punches about his dislike of what he calls “fakes.”
He believes lab-grown to be detrimental to the natural-diamond industry, because the fall of synthetic prices “pulls down the price of real diamonds.”
He’s also not shy about making it known how damaging he thinks De Beers was with its marketing of lab-grown.
“De Beers made a tremendous self-destructive move by introducing a product which is undermining the basic product they sell,” he explains. “They cannibalized their own sales and did a tremendous disservice to the industry.”
However, Polnauer believes when it comes to lab-grown, there is a light at the end of the tunnel.
“Lab-grown is stealing the story from natural diamonds,” he says. “But there is a saying: ‘When the music stops, the dancing stops,’ so hopefully everything will work out for the best.”
Staying optimistic His brazenness has seen Polnauer ride out many market ups and downs, the latest challenge being the Israel-Hamas war that started when the latter attacked the country on October 7. When asked if it’s affected his business, he says it has. While he notes that those who want to buy his products still will, and those who don’t never would have anyway, he believes the negative sentiment is “poison” for an industry based on “illusion and sentiment.”
Despite it all, he remains hopeful. When it comes to the future of the trade, he thinks “fancy-colored diamonds will flourish, gemstones will flourish and the jewelry market will flourish, because I’m an optimist, and if you put that positivity out there, everything will work out.”
Storm Mountain Diamonds (SMD), jointly owned by Namakwa Diamonds Limited and the Government of Lesotho, has recovered a 108.39-carat fancy pink diamond at its Kao Mine in the Southern African country.
The diamond is one of the largest pink roughs ever found in Africa, which include the “Lulo Rose”, 170-carat precious stone recovered by Australia’s Lucapa Diamond in Angola last year.
SMD said the diamond was recovered from a 1.5 tonne sample of kimberlite ore that was processed at the mine’s plant.
It is a Type IIa stone, which means it has very few impurities and a high level of clarity, the company said.
The Kao Mine is one of the largest diamond mines in Lesotho and produces about 400,000 carats of diamonds annually.
Coloured diamonds, especially pink ones, have repeatedly set record-setting prices in recent years as they are rarer than white ones. While they come in many hues, pink and blue are the most coveted.
A 21.86 carat natural pink diamond named “The Pink Palesa” will be sold by the Bonas Group in Antwerp in July.
Credit: Namakwa Diamonds
The pink gem was discovered on May 18 at the Kao mine in Lesotho one of the few sources of pink diamonds in the world following the closure of the iconic Argyle mine last year. Argyle provided about 90% of the world’s pink gems. Kao is operated and owned by Namakwa through its subsidiary, Storm Mountain Diamonds.
According to the report, Kao has yielded several pink diamonds in the last few years: The 25.97 carat Pink Dawn (2021), the 36.06-carat Pink Storm sold in 2014, the 3.06 carat Purple Princess (2017) and the 29.59 carat Rose of Kao (2018).
A 21.86 carat natural pink diamond named “The Pink Palesa” will be sold by the Bonas Group in Antwerp in July.
Credit: Namakwa Diamonds
The pink gem was discovered on May 18 at the Kao mine in Lesotho one of the few sources of pink diamonds in the world following the closure of the iconic Argyle mine last year. Argyle provided about 90% of the world’s pink gems. Kao is operated and owned by Namakwa through its subsidiary, Storm Mountain Diamonds.
According to the report, Kao has yielded several pink diamonds in the last few years: The 25.97 carat Pink Dawn (2021), the 36.06-carat Pink Storm sold in 2014, the 3.06 carat Purple Princess (2017) and the 29.59 carat Rose of Kao (2018).
A 2.17-carat fancy vivid purplish pink diamond fetched $3.5m at auction, well above its high estimate of $2.5m.
It was the most expensive of a “Perfect Palette” of three colored diamonds that raised a total of $8.4m last week at Christie’s New York April Magnificent Jewels.
The pink diamond (pictured) was a cut-cornered square modified brilliant-cut stone, natural color, SI1 clarity, set with round diamonds in a platinum and 18k yellow gold ring.
A fancy vivid blue cut-cornered rectangular modified brilliant-cut diamond of 2.13 carats, natural color, VS1 clarity, set in a platinum ring with round diamonds, sold for $2.67m (high estimate $3m).
And a fancy vivid orange cut-cornered rectangular modified brilliant-cut diamond of 2.34 carats, natural color, VS1 clarity, set in platinum and 18k yellow gold, sold for $2.19m (high estimate $2.5m).
The sale of over 200 lots – including signed pieces by Belperron, Bulgari, Cartier, Graff, Harry Winston, Hemmerle, JAR, Lacloche, Tiffany & Co., and Van Cleef & Arpels – brought in a total of $35m.
Christie’s said there were bids from 40 countries and 94 per cent of lots were sold.
A 2.17-carat fancy vivid purplish pink diamond fetched $3.5m at auction, well above its high estimate of $2.5m.
It was the most expensive of a “Perfect Palette” of three colored diamonds that raised a total of $8.4m last week at Christie’s New York April Magnificent Jewels.
The pink diamond (pictured) was a cut-cornered square modified brilliant-cut stone, natural color, SI1 clarity, set with round diamonds in a platinum and 18k yellow gold ring.
A fancy vivid blue cut-cornered rectangular modified brilliant-cut diamond of 2.13 carats, natural color, VS1 clarity, set in a platinum ring with round diamonds, sold for $2.67m (high estimate $3m).
And a fancy vivid orange cut-cornered rectangular modified brilliant-cut diamond of 2.34 carats, natural color, VS1 clarity, set in platinum and 18k yellow gold, sold for $2.19m (high estimate $2.5m).
The sale of over 200 lots – including signed pieces by Belperron, Bulgari, Cartier, Graff, Harry Winston, Hemmerle, JAR, Lacloche, Tiffany & Co., and Van Cleef & Arpels – brought in a total of $35m.
Christie’s said there were bids from 40 countries and 94 per cent of lots were sold.
A 15.81 carat Sakura diamond, the largest of its kind to ever appear for sale, will go under the hammer at Christie’s upcoming Hong Kong Magnificent Jewels Live Auction on May 23, the auction house announced on Tuesday. Estimated at $25 million to $38 million, the “fancy vivid purple pink internally flawless” diamond will be the star highlight of the sale.
It is the diamond’s exceptional rarity, extraordinary optical transparency, brilliant colour, and enormous size that make it an immensely important, and eternal masterpiece of nature.
As fewer than 10 per cent of pink diamonds weigh more than one-fifth of a carat, this fancy vivid purple-pink diamond is of an unprecedented size of 15.81 carats, which is the largest of its kind Fancy Vivid Purple Pink to be offered at any auction.
It added that the lot fell in the exclusive group of the four per cent of pink diamonds that possess a colour deep enough to qualify as “fancy vivid”.
This magnificent gem is graded ‘fancy vivid’ for its perfect display of strong saturation and remarkable pink hue with a secondary colour of purple, resembling the fascinating colour of cherry blossoms – appropriately coinciding with spring.
A 15.81 carat Sakura diamond, the largest of its kind to ever appear for sale, will go under the hammer at Christie’s upcoming Hong Kong Magnificent Jewels Live Auction on May 23, the auction house announced on Tuesday. Estimated at $25 million to $38 million, the “fancy vivid purple pink internally flawless” diamond will be the star highlight of the sale.
It is the diamond’s exceptional rarity, extraordinary optical transparency, brilliant colour, and enormous size that make it an immensely important, and eternal masterpiece of nature.
As fewer than 10 per cent of pink diamonds weigh more than one-fifth of a carat, this fancy vivid purple-pink diamond is of an unprecedented size of 15.81 carats, which is the largest of its kind Fancy Vivid Purple Pink to be offered at any auction.
It added that the lot fell in the exclusive group of the four per cent of pink diamonds that possess a colour deep enough to qualify as “fancy vivid”.
This magnificent gem is graded ‘fancy vivid’ for its perfect display of strong saturation and remarkable pink hue with a secondary colour of purple, resembling the fascinating colour of cherry blossoms – appropriately coinciding with spring.
The gem-quality 46 carat rough pink diamond was sold by SML into a cutting and polishing partnership with SML’s preferred buyer, Safdico International.
Under the partnership agreement, SML retained a share in the margin to be generated from the sale of the resultant polished diamonds.
The Lulo partners are pleased to advise the results delivered from cutting & polishing the 46 carat diamond.
The rough diamond delivered three polished diamonds a 15.2 carat Heart and two Pear shaped diamonds weighing 3.3 carats and 2.3 carats.
The main delivery, a 15.2 carat Heart shaped diamond was graded by the Gemmological Institute of America (GIA) as Fancy Intense Orangy Pink, with a clarity grade of VVS1 and Excellent gradings for both polish and symmetry.
The 46 carat pink coloured diamond is the largest gem quality coloured rough diamond recovered to date from Lulo mining operations.
The gem-quality 46 carat rough pink diamond was sold by SML into a cutting and polishing partnership with SML’s preferred buyer, Safdico International.
Under the partnership agreement, SML retained a share in the margin to be generated from the sale of the resultant polished diamonds.
The Lulo partners are pleased to advise the results delivered from cutting & polishing the 46 carat diamond.
The rough diamond delivered three polished diamonds a 15.2 carat Heart and two Pear shaped diamonds weighing 3.3 carats and 2.3 carats.
The main delivery, a 15.2 carat Heart shaped diamond was graded by the Gemmological Institute of America (GIA) as Fancy Intense Orangy Pink, with a clarity grade of VVS1 and Excellent gradings for both polish and symmetry.
The 46 carat pink coloured diamond is the largest gem quality coloured rough diamond recovered to date from Lulo mining operations.
