Rare ‘Mellon Blue’ Diamond Fetches $25.5 Million at Christie’s Geneva – Market Reflects Shifting Demand for Coloured Diamonds

The legendary Mellon Blue Diamond a 9.51-carat fancy vivid blue, internally flawless gem sold for $25.5 million USD at Christie’s Magnificent Jewels auction in Geneva this week. The sale, held at the Four Seasons Hotel des Bergues, drew global attention from elite collectors and gem enthusiasts alike.

The Mellon Blue once belonged to renowned art collector Rachel Lambert “Bunny” Mellon, whose refined taste and cultural influence continue to shape the world of art and jewellery. Despite its exquisite pedigree, the price achieved represents a 22 percent decrease from its previous sale 11 years ago and a nearly 60 percent drop in real value when adjusted for inflation.

Originally auctioned at Sotheby’s in 2014 as part of Mellon’s estate collection, the diamond fetched $32.6 million USD, setting a world record for a blue diamond at that time. Adjusted for inflation, that sum equates to approximately $44.7 million in 2025.

Christie’s had estimated the gem between $20 million and $30 million, and the final sale once again highlighted the continuing prestige of exceptional coloured diamonds despite softer market conditions.

Rahul Kadakia, Christie’s Chairman of Global Luxury and President of Asia Pacific, remarked:

“It was a true honour to offer for sale the exquisite Mellon Blue Diamond here at Christie’s Geneva. It was another notable moment for Christie’s Luxury, evidencing the elite appetite amongst collectors for extraordinary and storied gems.”

The winning bidder, identified only as a collector from Hong Kong, continued the stone’s legacy of global fascination.

While the Mellon Blue once held the world record for a blue diamond, that benchmark has since been overtaken by two other remarkable stones:

• The 14.62-carat Oppenheimer Blue, sold at Christie’s in 2016 for $57.5 million USD
• The 15.10-carat De Beers Cullinan Blue, sold by Sotheby’s in 2022, also for $57.5 million USD

These historic sales underline the rarity and enduring appeal of fancy vivid blue diamonds, which represent less than 0.1 percent of all diamonds, and of those, fewer than 1 percent qualify as fancy vivid.

Bunny Mellon, who passed away in 2014 at age 103, was celebrated not only for her wealth being heiress to the Listerine and Mellon fortunes but also for her artistry and impeccable taste. She famously designed the White House Rose Garden and curated an impressive art collection that included two Rothko masterpieces, which together realised $76 million USD at auction.

When Christie’s announced the diamond’s return to auction earlier this year, Kadakia described the sale as a tribute to Mellon’s lasting influence, saying her legacy “elevates the Mellon Blue’s allure by tying it to her sophisticated aesthetic and cultural prominence.”

The auction itself was as heated as the competition literally with the auctioneer requesting the windows be opened mid-sale to cool the room as bidding intensified.

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About DCLA: The Diamond Certification Laboratory of Australia (DCLA) is the official CIBJO-recognised diamond laboratory in Australia, specialising in independent diamond grading and certification. DCLA ensures the highest international standards of accuracy, integrity, and transparency in diamond evaluation.

Rare 10-Carat Blue Diamond Could Fetch $20 Million at Sotheby’s Geneva Auction

A remarkable 10-carat blue diamond, dubbed the “Mediterranean Blue Diamond,” is expected to achieve up to $20 million when it goes under the hammer at Sotheby’s in Geneva on 13 May. The diamond, which boasts the highly coveted “fancy vivid blue” colour grade, represents one of the most prized and rare categories in the world of coloured diamonds.

Discovered in 2023 at South Africa’s famed Cullinan mine, the Mediterranean Blue was originally a rough diamond weighing an impressive 31.94 carats. What followed was an extraordinary journey — a full year of study, including precise analysis to maximise both beauty and value, and six months of planning and expert cutting to reveal the gem in its final cushion-shaped form.

Sotheby’s, which is overseeing the auction, describes the diamond as a standout in its class. Jessica Wyndham, head of high jewellery at Sotheby’s Geneva, remarked, “The market for coloured diamonds continues to go from strength to strength.” Indeed, blue diamonds of this size and calibre are vanishingly rare, and collectors around the world are likely to compete fiercely for the chance to own such an exceptional gem.

Fancy vivid blue is the highest grading for coloured diamonds, denoting a saturation and purity of colour that few stones ever achieve. The Mediterranean Blue, with its intense oceanic hue and exceptional clarity, is a testament to nature’s rarity and human craftsmanship.

Over the years, similar diamonds have fetched extraordinary prices. In 2016, the “Oppenheimer Blue,” a 14.62-carat fancy vivid blue diamond, sold for a staggering $68.7 million at Christie’s in Geneva, setting a world record for any fancy vivid blue diamond sold at auction. That same year, another exceptional blue stone — a 24.18-carat intense blue diamond also mined from the Cullinan site — sold for $25 million, reinforcing the global appetite for ultra-rare coloured diamonds.

The Cullinan mine, known for producing some of the world’s most famous diamonds — including parts of the Cullinan I and II, which are part of the British Crown Jewels — has once again proven its status as a source of legendary stones.

With demand for coloured diamonds surging, particularly among high-net-worth collectors and investors seeking portable, tangible assets, the upcoming sale of the Mediterranean Blue Diamond is expected to draw worldwide attention.

Its appearance at auction not only marks a rare opportunity to acquire a gem of unmatched beauty and provenance, but also reflects the continuing strength and allure of the coloured diamond market — where rarity and story combine to create lasting value.

Source: DCLA

5.72-ct Blue Diamond Sells for $8.8m

A 5.72 carat fancy intense blue diamond beat its high estimate and sold for $8.8m yesterday (10 December) at Christie’s New York.

The cushion brilliant cut VVS1 stone, set in a platinum ring with round diamonds, was the highlight of the Magnificent Jewels auction.

The price realized was $1,539,336 per carat. The pre-sale estimate was $6m to $8m.

The second highest price was for a pair of Harry Winston spinel and diamond earrings. They sold for $2,228,000—four times their high estimate of $600,000.

The sale raised a total of $49.2m, with 97 per cent of the 179 lots finding buyers. 

Rahul Kadakia, Christie’s international head of jewelry, said: “Today’s sale in New York was a testament to the vibrant market for jewelry of the highest caliber with singular provenance.

“We were particularly pleased with the result of the top lot – a fantastic fancy intense blue diamond ring that sold for $8.8m.”

The Fancy Color Research Foundation gave the blue diamond a visual score of 8 out of 12 in its pre-sale analysis, noting its low color dispersion.

It said: “True Face-Up: Equivalent to that of a 9.15 carat which is ~59.9 per cent larger than the average

“Analysis: A Fancy Intense Blue Cushion brilliant-cut diamond,  polished as a classic colorless diamond, probably manufactured during the 1960s or 1970s. 

“The diamond’s inner-grade is very strong, and modifying its facet alignment could increase its saturation to vivid. No significant gray undertone is present in the color.”

Source: DCLA

Blue and Pink Diamond Ring Fetches $3.7m

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.

Source: DCLA

Fancy colour diamond prices up 3.9% in 2022

 

     Only one in 10,000 diamonds found are coloured,           according to the Gemological Institute of America.

Average prices for fancy coloured diamonds of any size climbed by 3.9% in 2022, led by yellows and pinks, the Fancy Color Research Foundation (FCRF), a non-profit that promotes transparency and fair trade in the market, said on Wednesday.

The industry body said prices for all yellow diamonds climbed by 4.6% from the previous year, followed by a 3.9% rise in pinks and 1.8% in blues. 

The improved prices reached by these diamonds, the FCRF said, contrast with the annual decline in white diamonds prices.

“2022 was a very good year for yellow fancy colour diamonds in all sizes and saturations. It seems like yellow diamonds with high visual grades and in certain shapes increased by more than what is reflected in the Index,” FCRF data supplier, Israel Papushado, said in a statement.

Source: FCRF.

“Pink fancy colour diamonds performed with no significant change in comparison to previous years; however, blue diamonds did not perform as expected, probably due to limitations in the Chinese market,” he noted.

The prices reported by the FCRF are based on its own Fancy Colour Diamond Index, which is built on tracked data for yellow, pink, and blue fancy colour diamonds’ performance in major global trading centres such as Hong Kong, New York, Geneva and Tel Aviv.

Nature bestows fancy colours on about one in every 10,000 rough diamonds of gem quality that are mined around the world.

The precious stones that can be blue, pink or green form a special asset class, relying on a consumer preference for exotic and unusual items. This also means they are less affected by other factors driving supply and demand in the main diamond market.

Source: Mining.com

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

Blues Lead Fancy Colour Prices

Fancy blue diamonds out performed other major color categories in price terms during the first quarter, the Fancy Color Research Foundation said.

Prices for fancy blues jumped 5% year on year for the three months ending March 31, according to the FCRF, which released its quarterly Fancy Color Diamond Index on Monday.

By contrast, prices of fancy pink diamonds declined 1.7%, while the index for yellows slipped 0.6%, the organization said. The overall index for fancy color diamonds edged up 0.1%.

Vivid blues and vivid pinks weighing 2 carats showed the best performance in their respective color categories during the quarter.

The Fancy Color Diamond Index tracks prices of fancy yellow, pink and blue diamonds in Hong Kong, New York and Tel Aviv.

Source: DCLA

Blues Lead Fancy Colour Prices

Fancy blue diamonds out performed other major color categories in price terms during the first quarter, the Fancy Color Research Foundation said.

Prices for fancy blues jumped 5% year on year for the three months ending March 31, according to the FCRF, which released its quarterly Fancy Color Diamond Index on Monday.

By contrast, prices of fancy pink diamonds declined 1.7%, while the index for yellows slipped 0.6%, the organization said. The overall index for fancy color diamonds edged up 0.1%.

Vivid blues and vivid pinks weighing 2 carats showed the best performance in their respective color categories during the quarter.

The Fancy Color Diamond Index tracks prices of fancy yellow, pink and blue diamonds in Hong Kong, New York and Tel Aviv.

Source: DCLA

$5.3 USD Million Record Price for a Fancy Intense Blue

A 3.09 carat emerald cut fancy intense blue diamond has sold for more than $5.3 million.

Setting a new record price per carat for an intense blue diamond.

The Polished Blue Diamond was set in a platinum ring flanked by tapered baguette cut diamonds.

The Fancy Intense Blue Diamond sold well above its high total estimate of $3 million.

Source: DCLA

$5.3 USD Million Record Price for a Fancy Intense Blue

A 3.09 carat emerald cut fancy intense blue diamond has sold for more than $5.3 million.

Setting a new record price per carat for an intense blue diamond.

The Polished Blue Diamond was set in a platinum ring flanked by tapered baguette cut diamonds.

The Fancy Intense Blue Diamond sold well above its high total estimate of $3 million.

Source: DCLA