Showing posts with label yellow diamonds. Show all posts
Showing posts with label yellow diamonds. Show all posts

Sunday 22 September 2024

“Most Coveted” A 16.9 ct Fancy Vivid Yellow Diamond

flawless 16.92 carat vivid yellow diamond

A flawless 16.92 carat vivid yellow diamond was unveiled last week at Jewellery & Gem World Hong Kong.

Mumbai based Venus Jewel says the radiant shaped natural diamond is one of the “most coveted diamonds” it has released in its 55 year history.

It was cut from a 28.78 carat rough stone. Natural vivid yellow colored diamonds are extremely rare. One out of approximately 10,000 carats mined is a natural fancy color diamond. Of those only a small percentage are fancy vivid, the highest grading for color saturation and brilliance.

“We are delighted to present the Yellow Lava, a true testament to our craftsmanship, energy and dynamism,” said Rajesh Shah, a partner in the company.

“The name Yellow Lava is derived from its evenly distributed vivid yellow color and flawless clarity.”

Source: DCLA

Thursday 12 September 2024

Holly Ramsay Perfect Yellow Diamond Engagement Ring from Adam Peaty

Holly Ramsay Perfect Yellow Diamond Engagement Ring from Adam Peaty

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.”

Source: DCLA

Tuesday 11 June 2024

45 Carat yellow diamond could fetch $3.5m

45 Carat yellow diamond could fetch $3.5m

A 45.07 carat fancy vivid yellow diamond is forecast to sell for $2.8m to $3.5m at Phillips New York on Wednesday (12 June).

It leads the New York Jewels Auction, featuring colored diamonds and gemstones, period jewelry, and signed jewels by Cartier, Bulgari, and Van Cleef & Arpels.

The square emerald-cut VS1-clarity stone has classic step-cut faceting, considered an unusual choice to best show off the color and draw out the illusion of greater saturation.

The Fancy Color Research Foundation (FCRF) gives the diamond a total visual score of 11 out of 12, based on inner grade (3), color dispersion (4) and undertone (4), noting that despite its depth percentage, excellent polish and symmetry grades, its visual presence translates to “a diamond appearing smaller in carat weight”.

The diamond will realize $77,657 per carat if it hits its high estimate. In March a 15.51-carat VS2 fancy vivid yellow diamond sold for $1.14m – $73,253 per carat – at Phillips Hong Kong Jewels Auction, beating its low estimate.

Source: DCLADCLA

Wednesday 8 May 2024

101-ct Allnatt Yellow Diamond Could Fetch $7.2m

101-ct Allnatt Yellow Diamond Could Fetch $7.2m

The 101.29-carat Allnatt diamond, described as one of the world’s most significant fancy vivid yellow stones, is to be auctioned at Sotheby’s Geneva, with an estimate of $6.2m to $7.2m.

The Type 1a gem, from South Africa, was named after the British racehorse owner and art collector Major Alfred Ernest Allnatt, who bought in in the 1950s. He had it mounted in a brooch by Cartier.

The Allnatt forms the heart of a flowerhead composed of openwork, brilliant-cut diamond-set petals enhanced with baguette diamonds.

It was last offered at auction in Geneva in May 1996 – as the ‘Property of a Lady’ – and sold for just over $3m. At the time it weighed 102.07 carats and was graded fancy intense yellow by the GIA.

It was subsequently repolished to its current 101.29 carats, which bought the color up to fancy vivid yellow.

The Allnatt diamond leads the Magnificent Jewels and Noble Jewels sale on May 14.

Source: DCLA

Thursday 23 November 2023

Yellow Diamond Ring to Lead Bonhams Sale


Yellow Diamond Ring to Lead Bonhams Sale

A 10.19-carat yellow diamond ring will lead an upcoming auction at Bonhams in London, where it is set to fetch up to GBP 160,000 (approximately $199,300).

Bonhams will offer the radiant-cut, fancy-intense-yellow, VS1-clarity stone, set between shield-cut diamond shoulders, at its December 7 London Jewels auction, it said Tuesday.

Two additional yellow diamonds for sale include a brilliant-cut, 10.02-carat, fancy-yellow diamond single-stone ring and a step-cut, 8.45-carat, fancy-yellow diamond ring accented by four pear-shaped diamonds set between baguette and step-cut diamond shoulders. Both pieces carry estimates of GBP 50,000 to GBP 70,000 (approximately $62,300 to $87,200).

The 149-lot auction will also feature pieces from multiple single-owner private collections, spanning from 1870 to the modern day. These comprise jewels from Cartier, Bulgari, Graff, Moussaieff, Van Cleef & Arpels, Harry Winston, Boucheron, Tiffany & Co., David Webb, and Grima.

Highlights from a single-owner private European collection are a Lalique Art Nouveau enamel, pâte-de-verre, sapphire and diamond pendant from around 1905 to 1915; a Cartier Panthère coral, emerald, onyx and diamond brooch, circa 1968; and a Cartier ruby and diamond clip and ear clip suite brooch combination that dates to about 1960.

Another collection, from a descendant of Dorothy Maud, Countess Haig, boasts a pearl and diamond tiara necklace presented to the countess by Queen Alexandra in 1905 on her marriage to General Haig.

Source: DCLA

Tuesday 14 November 2023

Sparkling Orange-Yellow Diamond Earrings Could Fetch $12 Million At Christie’s Auction


Sparkling Orange-Yellow Diamond Earrings

A pair of fancy vivid orange-yellow diamond earrings weighing 12.20 and 11.96 carats will be the top lot at Christie’s Magnificent Jewels sale on December 6 in New York. The earrings, which are named “California Sunset Diamonds,” are estimated at $7 million – $12 million.

A ring with a similar fancy vivid yellowish orange diamond weighing 5.16 carats has an estimate of $1.5 million – $2 million.

A 5.16-carat fancy vivid yellowish orange diamond has an estimate of $1.5 - $2 million
A 5.16-carat fancy vivid yellowish orange diamond has an estimate of $1.5 million – $2 million CHRISTIE’S

There haven’t been many details released yet for Christie’s final jewelry auction of 2023, but the sale will include several fancy colored diamonds, white diamonds and colored gems. As always, there will be signed jewels from important collections.

Source: DCLA

Thursday 8 December 2022

303ct. Golden Canary Sets Sales Soaring at Sotheby’s

                       303ct. Golden Canary
303 carat Golden Canary Diamond

The 303.10-carat Golden Canary fetched $12.4 million at Sotheby’s Magnificent Jewels in New York on Wednesday, becoming the third most valuable yellow diamond ever sold at auction, the company reported.

The pear-shaped, fancy-deep-brownish-yellow stone is the world’s largest known internally flawless diamond. It is also the largest flawless or internally flawless diamond graded by the Gemological Institute of America (GIA), Sotheby’s said Thursday.  The auction house offered the piece without reserve, but predicted it would bring in more than $15 million.

The diamond was initially discovered in the Democratic Republic of Congo (DRC) in the early 1980s. Originally called the Incomparable Diamond, the stone was recut from its previous 407-carat shield shape to deepen the color and brighten the hue.

“The Golden Canary captivated me from the moment I saw it — with its monumental size, golden hue and impeccable clarity — it is truly an extraordinary diamond with immense presence,” said Quig Bruning, head of jewelry for the Americas at Sotheby’s.

Source: DCLA

Thursday 27 January 2022

Yellow Gems Top a Year of Discoveries at the Crater of Diamonds

                           

By the end of summer 2021, park guests had found 255 diamonds, including four weighing over one carat. Autumn kicked off with a big surprise for one California couple, when Noreen Wredberg and her husband, of Granite Bay, visited the Crater of Diamonds for the first time.

Wredberg was walking on the north side of a central pathway through the search area on September 23 when she spotted something sparkling on top of the ground. Her find turned out to be the largest of the year, a 4.38-carat diamond about the size of a jellybean, with a pear shape and a lemonade yellow color. Wredberg named her gem after her husband’s kitten, calling it Lucy’s Diamond.

The three most common colors of diamonds found at the Crater are white, brown, and yellow. 248 diamonds registered last year were white (weighing 28.6 carats), 54 were brown (16.67 carats), and 52 were yellow (17.02 carats). Interestingly, all nine of the largest diamonds found last year were yellow or brown in color.

Source: DCLA

Yellow Gems Top a Year of Discoveries at the Crater of Diamonds

                           

By the end of summer 2021, park guests had found 255 diamonds, including four weighing over one carat. Autumn kicked off with a big surprise for one California couple, when Noreen Wredberg and her husband, of Granite Bay, visited the Crater of Diamonds for the first time.

Wredberg was walking on the north side of a central pathway through the search area on September 23 when she spotted something sparkling on top of the ground. Her find turned out to be the largest of the year, a 4.38-carat diamond about the size of a jellybean, with a pear shape and a lemonade yellow color. Wredberg named her gem after her husband’s kitten, calling it Lucy’s Diamond.

The three most common colors of diamonds found at the Crater are white, brown, and yellow. 248 diamonds registered last year were white (weighing 28.6 carats), 54 were brown (16.67 carats), and 52 were yellow (17.02 carats). Interestingly, all nine of the largest diamonds found last year were yellow or brown in color.

Source: DCLA

Wednesday 2 June 2021

The Largest Diamond Ever Mined in North America up for Auction


 The Largest Diamond Ever Mined in North America up for Auction  204.36-carat “Dancing Sun” fancy intense yellow diamond A 204.36 carat fancy yellow diamond hits the block at the Christie’s Magnificent Jewels auction on June 8 in New York City. The Dancing Sun, with an estimate of $3.5 million to $5.5 million, is the largest polished diamond ever mined in North America.  It was cut from a piece of rough weighing 552.74 carats. Six smaller diamonds were cut from the same rough, ranging from 14.52 to 1.06 carats, and are also included in the sale. All six are set into rings. The rough diamond came from the Diavik Diamond Mine, the second to open following the great Canadian diamond rush of the 1990s.  The previous record for the largest known gem quality rough ever mined in North America was the 187.66 carat Foxfire rough, also mined at Diavik. It was cut into several gems, including a pair of pear shapes weighing 37.87 and 36.80 carats, auctioned at Christie’s New York in December 2018 for $1.5 million.
     204.36-carat “Dancing Sun” fancy intense yellow                                        diamond

A 204.36 carat fancy yellow diamond hits the block at the Christie’s Magnificent Jewels auction on June 8 in New York City. The Dancing Sun, with an estimate of $3.5 million to $5.5 million, is the largest polished diamond ever mined in North America.

It was cut from a piece of rough weighing 552.74 carats. Six smaller diamonds were cut from the same rough, ranging from 14.52 to 1.06 carats, and are also included in the sale. All six are set into rings. The rough diamond came from the Diavik Diamond Mine, the second to open following the great Canadian diamond rush of the 1990s.

The previous record for the largest known gem quality rough ever mined in North America was the 187.66 carat Foxfire rough, also mined at Diavik. It was cut into several gems, including a pair of pear shapes weighing 37.87 and 36.80 carats, auctioned at Christie’s New York in December 2018 for $1.5 million.

Source; DCLA

The Largest Diamond Ever Mined in North America up for Auction


 The Largest Diamond Ever Mined in North America up for Auction  204.36-carat “Dancing Sun” fancy intense yellow diamond A 204.36 carat fancy yellow diamond hits the block at the Christie’s Magnificent Jewels auction on June 8 in New York City. The Dancing Sun, with an estimate of $3.5 million to $5.5 million, is the largest polished diamond ever mined in North America.  It was cut from a piece of rough weighing 552.74 carats. Six smaller diamonds were cut from the same rough, ranging from 14.52 to 1.06 carats, and are also included in the sale. All six are set into rings. The rough diamond came from the Diavik Diamond Mine, the second to open following the great Canadian diamond rush of the 1990s.  The previous record for the largest known gem quality rough ever mined in North America was the 187.66 carat Foxfire rough, also mined at Diavik. It was cut into several gems, including a pair of pear shapes weighing 37.87 and 36.80 carats, auctioned at Christie’s New York in December 2018 for $1.5 million.
     204.36-carat “Dancing Sun” fancy intense yellow                                        diamond

A 204.36 carat fancy yellow diamond hits the block at the Christie’s Magnificent Jewels auction on June 8 in New York City. The Dancing Sun, with an estimate of $3.5 million to $5.5 million, is the largest polished diamond ever mined in North America.

It was cut from a piece of rough weighing 552.74 carats. Six smaller diamonds were cut from the same rough, ranging from 14.52 to 1.06 carats, and are also included in the sale. All six are set into rings. The rough diamond came from the Diavik Diamond Mine, the second to open following the great Canadian diamond rush of the 1990s.

The previous record for the largest known gem quality rough ever mined in North America was the 187.66 carat Foxfire rough, also mined at Diavik. It was cut into several gems, including a pair of pear shapes weighing 37.87 and 36.80 carats, auctioned at Christie’s New York in December 2018 for $1.5 million.

Source; DCLA

Thursday 27 May 2021

73ct. Yellow to Shine at Sotheby’s New York Sale

                            73.11 carat yellow diamond

Sotheby’s will offer a fancy-vivid-yellow diamond ring at its New York sale next month, estimating the piece could fetch up to $3 million.

The cut-cornered square step-cut, 73.11-carat, VS2-clarity jewel by Mayfair designer Glenn Spiro, called The Sienna Star, is one of the largest fancy-vivid-yellow diamonds to come to auction, Sotheby’s said Wednesday. The piece is one of the top items at the June 9 Magnificent Jewels sale. The auction will feature jewelry for the “Roaring Twenties 2.0” as people return to the social scene following long lockdowns, Sotheby’s noted.

A private collection of six jewels with a combined estimate of more than $13 million are another headline lot at the New York sale. Those include a necklace by Andrew Clunn, set with 28 oval-shaped diamonds totaling over 168 carats, which carries a high estimate of $3 million, and an emerald-cut, 23.59-carat, D-color, internally flawless, type IIa diamond ring with an upper valuation of $2.8 million.

A Colombian emerald and diamond garland necklace by Harry Winston, estimated at up to $2.5 million, and a 13.02-carat Burmese ruby ring, mounted by Carvin French, with a $2 million high valuation, are also part of the collection. Proceeds from the sale of those six items will be donated to charity.

Additionally, Sotheby’s will showcase a Bulgari ring with a 25.29-carat Kashmir sapphire flanked by diamonds, which it expects will bring in up to $3 million. Meanwhile, a modified square brilliant-cut, 3.75-carat, fancy-intense-pink, VVS1-clarity diamond ring, accented by triangle-shaped and round diamonds, is estimated to fetch up to $2.5 million.

The auction house will present jewels from the collection of philanthropist Margaret Jonsson Rogers, the daughter of Texas Instruments founder and Dallas mayor J. Erik Jonsson, as well as property from the estate of Mary Ethel Weinmann, the daughter of Count and Countess André de Limur, it added.

Source: DCLA

73ct. Yellow to Shine at Sotheby’s New York Sale

                            73.11 carat yellow diamond

Sotheby’s will offer a fancy-vivid-yellow diamond ring at its New York sale next month, estimating the piece could fetch up to $3 million.

The cut-cornered square step-cut, 73.11-carat, VS2-clarity jewel by Mayfair designer Glenn Spiro, called The Sienna Star, is one of the largest fancy-vivid-yellow diamonds to come to auction, Sotheby’s said Wednesday. The piece is one of the top items at the June 9 Magnificent Jewels sale. The auction will feature jewelry for the “Roaring Twenties 2.0” as people return to the social scene following long lockdowns, Sotheby’s noted.

A private collection of six jewels with a combined estimate of more than $13 million are another headline lot at the New York sale. Those include a necklace by Andrew Clunn, set with 28 oval-shaped diamonds totaling over 168 carats, which carries a high estimate of $3 million, and an emerald-cut, 23.59-carat, D-color, internally flawless, type IIa diamond ring with an upper valuation of $2.8 million.

A Colombian emerald and diamond garland necklace by Harry Winston, estimated at up to $2.5 million, and a 13.02-carat Burmese ruby ring, mounted by Carvin French, with a $2 million high valuation, are also part of the collection. Proceeds from the sale of those six items will be donated to charity.

Additionally, Sotheby’s will showcase a Bulgari ring with a 25.29-carat Kashmir sapphire flanked by diamonds, which it expects will bring in up to $3 million. Meanwhile, a modified square brilliant-cut, 3.75-carat, fancy-intense-pink, VVS1-clarity diamond ring, accented by triangle-shaped and round diamonds, is estimated to fetch up to $2.5 million.

The auction house will present jewels from the collection of philanthropist Margaret Jonsson Rogers, the daughter of Texas Instruments founder and Dallas mayor J. Erik Jonsson, as well as property from the estate of Mary Ethel Weinmann, the daughter of Count and Countess André de Limur, it added.

Source: DCLA

Monday 15 February 2021

Fancy-Color Price Index Beats Expectations

 


Prices of fancy-color diamonds slipped marginally in the fourth quarter of 2020 as stability in the yellow category helped the sector stave off a heavier slump, according to the Fancy Color Research Foundation (FCRF).

“Although 2020 was challenging in terms of logistics and travel, contrary to market expectations, fancy-color diamond prices proved to be resilient, with minor price decreases across the board,” the FCRF said Monday.

The organization’s Fancy Color Diamond Index for yellows inched down 0.3% year on year in the three months ending December 31, while prices for blues fell 1.3%. Pink fancy-color diamonds decreased 0.9%, with the overall index slipping 0.8%.

The 1.50- and 5-carat categories were the strongest for fancy blues, increasing 0.5% versus the previous quarter, while fancy-vivid blues decreased 0.6%, led by soft prices for 1-carat stones in that category. Pinks stayed mainly flat compared to the third quarter, with 2-carat fancy pinks seeing the highest rise, up 1.4%. In yellows, the fancy-intense, 5-carat segment grew 0.8%, and the price for fancy-vivid, 3-carat stones was up 0.7%. Fancy-yellow, 1.50-carat diamonds increased 0.6% during the period.

The FCRF believes prices of yellows will continue to remain strong throughout 2021.

“2020 was a fascinating year; wholesalers and retailers alike had to overcome many logistical hurdles in order to finalize simple transactions, while demand for fancy-color diamonds was solid,” said FCRF advisory board member Eden Rachminov. “I expect 2021 to be a bullish year for yellows; their current price is relatively low and I think that a price increase is inevitable.”

The index tracks prices of yellow, pink and blue fancy-color diamonds in Hong Kong, New York, Geneva and Tel Aviv.

Source: DCLA

Fancy-Color Price Index Beats Expectations

 


Prices of fancy-color diamonds slipped marginally in the fourth quarter of 2020 as stability in the yellow category helped the sector stave off a heavier slump, according to the Fancy Color Research Foundation (FCRF).

“Although 2020 was challenging in terms of logistics and travel, contrary to market expectations, fancy-color diamond prices proved to be resilient, with minor price decreases across the board,” the FCRF said Monday.

The organization’s Fancy Color Diamond Index for yellows inched down 0.3% year on year in the three months ending December 31, while prices for blues fell 1.3%. Pink fancy-color diamonds decreased 0.9%, with the overall index slipping 0.8%.

The 1.50- and 5-carat categories were the strongest for fancy blues, increasing 0.5% versus the previous quarter, while fancy-vivid blues decreased 0.6%, led by soft prices for 1-carat stones in that category. Pinks stayed mainly flat compared to the third quarter, with 2-carat fancy pinks seeing the highest rise, up 1.4%. In yellows, the fancy-intense, 5-carat segment grew 0.8%, and the price for fancy-vivid, 3-carat stones was up 0.7%. Fancy-yellow, 1.50-carat diamonds increased 0.6% during the period.

The FCRF believes prices of yellows will continue to remain strong throughout 2021.

“2020 was a fascinating year; wholesalers and retailers alike had to overcome many logistical hurdles in order to finalize simple transactions, while demand for fancy-color diamonds was solid,” said FCRF advisory board member Eden Rachminov. “I expect 2021 to be a bullish year for yellows; their current price is relatively low and I think that a price increase is inevitable.”

The index tracks prices of yellow, pink and blue fancy-color diamonds in Hong Kong, New York, Geneva and Tel Aviv.

Source: DCLA

Thursday 11 February 2021

24ct. Yellow Diamond Beats Estimate at Christie’s

 


A 23.58-carat diamond ring was the top lot at Christie’s Jewels Online sale, fetching well above its high estimate.

The piece, which featured a cut-cornered rectangular modified brilliant-cut, fancy-yellow, SI1-clarity stone, bracketed by two triangular-cut diamonds, brought in $325,000 against its $300,000 upper estimate, Christie’s said Wednesday. In total, the auction running from January 27 to February 10 garnered $2.7 million, with 98% of the items on offer finding buyers.

Two diamond rings sold for $81,250 each, just above their high valuations. One contained a round, 4.18-carat, F-color, VS2-clarity diamond. The other was set with an emerald-cut, 3.56-carat, D-color, internally flawless, type IIa diamond, flanked by two smaller emerald-cut and two triangular-cut diamonds. A diamond medallion necklace by Graff, bearing a total weight of 35.38 carats, also realized $81,250, within estimates.

A number of Graff diamond and gemstone jewels were sold without reserve at the auction. Those included a pair of emerald and diamond earrings, which brought in $40,000, beating estimates, and a ruby and diamond ring, which smashed its high valuation, fetching $32,500.

Meanwhile, a pair of aluminum Violet earrings by designer JAR garnered $13,750, more than four times their upper estimate.

Source: DCLA

24ct. Yellow Diamond Beats Estimate at Christie’s

 


A 23.58-carat diamond ring was the top lot at Christie’s Jewels Online sale, fetching well above its high estimate.

The piece, which featured a cut-cornered rectangular modified brilliant-cut, fancy-yellow, SI1-clarity stone, bracketed by two triangular-cut diamonds, brought in $325,000 against its $300,000 upper estimate, Christie’s said Wednesday. In total, the auction running from January 27 to February 10 garnered $2.7 million, with 98% of the items on offer finding buyers.

Two diamond rings sold for $81,250 each, just above their high valuations. One contained a round, 4.18-carat, F-color, VS2-clarity diamond. The other was set with an emerald-cut, 3.56-carat, D-color, internally flawless, type IIa diamond, flanked by two smaller emerald-cut and two triangular-cut diamonds. A diamond medallion necklace by Graff, bearing a total weight of 35.38 carats, also realized $81,250, within estimates.

A number of Graff diamond and gemstone jewels were sold without reserve at the auction. Those included a pair of emerald and diamond earrings, which brought in $40,000, beating estimates, and a ruby and diamond ring, which smashed its high valuation, fetching $32,500.

Meanwhile, a pair of aluminum Violet earrings by designer JAR garnered $13,750, more than four times their upper estimate.

Source: DCLA

Sunday 8 November 2020

6.70 ct Zimmi Yellow Diamond could Fetch $700,000

 

A rare 6.70-carat VS1 natural fancy deep yellow diamond from the famous Zimmi mine, in Sierra Leone, could fetch as much as $705,000 at auction.

Canary yellow diamonds from Zimmi can command double the price of other fancy yellows because of their uniquely high color saturation levels. Yellow Zimmi stones over five carats are extremely rare.

This gem will lead the Tiancheng International Jewellery and Jadeite Autumn Auction 2020 in Hong Kong on 28 November.

Also at the sale is a pair of Zimmi natural fancy deep yellow diamond earrings 3.03 carat and 3.01 carat with an estimate of up to $320,000.

The Zimmi mine is in the heart of the rainforest region of Sierra Leone where the Mano river marks the border with Liberia.

Yellow diamonds occur when a single nitrogen atom replaces a carbon atom, absorbing the violet and blue light.

Source: DCLA

6.70 ct Zimmi Yellow Diamond could Fetch $700,000

 

A rare 6.70-carat VS1 natural fancy deep yellow diamond from the famous Zimmi mine, in Sierra Leone, could fetch as much as $705,000 at auction.

Canary yellow diamonds from Zimmi can command double the price of other fancy yellows because of their uniquely high color saturation levels. Yellow Zimmi stones over five carats are extremely rare.

This gem will lead the Tiancheng International Jewellery and Jadeite Autumn Auction 2020 in Hong Kong on 28 November.

Also at the sale is a pair of Zimmi natural fancy deep yellow diamond earrings 3.03 carat and 3.01 carat with an estimate of up to $320,000.

The Zimmi mine is in the heart of the rainforest region of Sierra Leone where the Mano river marks the border with Liberia.

Yellow diamonds occur when a single nitrogen atom replaces a carbon atom, absorbing the violet and blue light.

Source: DCLA

Thursday 21 May 2020

Study yields new insight in hunt for rare, valuable yellow diamonds


A new study by University of Alberta scientists could help guide the search for rare, high-value yellow diamonds in the Canadian North.
The researchers, led by PhD student Mei Yan Lai, examined the chemical makeup of stones recovered from the Chidliak and Ekati mines in Northern Canada to get a better understanding of how they formed.
“Without this research, we wouldn’t know that two separate formation events occurred, and that the second, more recent event is responsible for the yellow colour,” explained U of A diamond geologist Thomas Stachel.
“The more we know about the origin of these potentially high-value diamonds, the better results for diamond exploration and value creation in Northern Canada.”
Lai said they wanted to understand the origin of the yellow colour in the diamonds from the two deposits.
“Canadian yellow diamonds have never been studied spectroscopically in detail. Our results suggest that the cause is the preservation of unstable single nitrogen atoms preserved inside the diamonds,” explained Lai, who conducted this research as part of her master’s studies in the Diamond Exploration Research Training School under the supervision of Stachel.
The research team determined that some yellow diamonds contain colourless cores, meaning that the yellow outer layers crystallized on top of clearer centres. Lai determined that the yellow diamonds crystallized no more than 30,000 years before the kimberlite eruptions that brought them up to Earth’s surface.
“Our analysis shows that the colourless cores in these yellow diamonds are about one billion years older,” Lai said. “In fact, the carbon isotope compositions and nitrogen concentrations of the colourless cores and yellow outer layers are significantly different, suggesting that they formed in at least two distinct events and involved different diamond-forming fluids.”
The researchers said discovering a potential new source of yellow diamonds in the Canadian North is economically significant, as the previous main source of high-quality yellow diamonds, the Ellendale Mine in Western Australia, was recently shut down.
The discovery of colourless cores in some of the yellow diamonds may also be of interest to the jewelry trade, said Lai.
“Occasionally, rough yellow diamonds lose their vibrant yellow colour after being cut and polished—probably because this kind of diamond has a thin layer of yellow overgrowth on top of the geologically older colourless core,” she said.
The project is a collaboration with Dominion Diamond Mines and Peregrine Diamonds Ltd. Part of the analyses were done at the Gemological Institute of America.
The research is supported by a bursary through DERTS, funded by the Natural Sciences and Engineering Research Council of Canada’s Collaborative Research and Training Experience program.
The study, “Yellow Diamonds With Colourless Cores—Evidence for Episodic Diamond Growth Beneath Chidliak and the Ekati Mine, Canada,” was published in Mineralogy and Petrology.
Source: DCLA

Downturn Forces GIA to Close Israel Lab

GIA is to close its lab in Ramat Gan, Israel, saying it is no longer “financially sustainable”. The facility, which opened in August 2012, w...