‘The Mellon Blue’ to Return to Auction, This Time at Christie’s
The 9.51-carat fancy vivid blue diamond, which set two world auction records at Sotheby’s in 2014, is estimated to fetch up to $30 million.

“The Mellon Blue,” a 9.51-carat pear-shaped diamond with internally flawless clarity, is estimated to achieve $20 million to $30 million at Christie’s Geneva in November.
The diamond, which was recently set as a ring, is a “rare expression of nature’s brilliance,” said Christie’s, remarkable for both its intense color and its extraordinary purity.
The piece will lead the Magnificent Jewels live sale, set to take place Nov. 11 at the Four Seasons Hotel des Bergues in Geneva.
Mellon, who held the blue diamond in her possession for decades, was the second wife of wealthy horse breeder Paul Mellon.
In the 1960s, she redesigned the White House Rose Garden at the request of President John F. Kennedy, adding more open space and introducing American species of plants to the garden. She was also involved with design projects in France that included the home of Hubert de Givenchy and the gardens at the Chateau de Versailles.
Her refined taste extended from her interiors and gardens to her jewelry, Christie’s said.
She died in 2014 at the age of 103, and later that same year, the diamond was offered at a Sotheby’s sale of her property. It set two records when it sold for $32.6 million—price paid for a blue diamond and price per-carat for any diamond.
The diamond has not been seen publicly since that auction.
“This stunning fancy vivid blue diamond, once belonging to America’s Garden Queen, and is among the finest colored diamonds to appear for sale at auction,” said Christie’s International Head of Jewellery Rahul Kadakia.
Kadakia also noted that Christie's has sold nine of the top 10 jewels at auction in the first half of the year.
Prior to the Magnificent Jewels sale, The Mellon Blue will be displayed at Christie’s Hong Kong from Oct. 23-28 and from Nov. 7-11 at the auction venue in Geneva.
The Latest

Edina Kiss’ “Popsicle” pendant and Karina Choudhrie’s “Ice Cream” charm satisfy that summer craving for a sweet piece of jewelry.

The massive billboard has been in the same spot on the department store’s Herald Square flagship store for decades.

The miner’s ruby and emerald auctions brought in a combined $102.9 million.

Retailers are seeking new ways to attract customers, increase traffic, and create revenue – Estate buying events are a popular solution.

The goal is for the De Beers sale to be finished by the second half of 2026, with the subsequent approvals process expected to take a year.


David Bonaparte, along with Tim Haake and Ronnie VanderLinden, continue to lobby for tariff exemptions for diamonds, gemstones, and pearls.

Survey respondents were concerned about the rising prices of food and groceries as well as unemployment.

Colored gemstones, artisan finishes, mixed metals, and meaningful details are shaping demand in bridal jewelry.

The trade show, slated for Sept. 4-8 in Vicenza, Italy, will feature sessions on trends, AI, gemology, and manufacturing.

The public shopping event featuring art, jewelry, watches, and rare collectibles, will take place in Santa Clara, California, this fall.

Endiama Commercial Director Elton Escrivão knows people have a lot of misperceptions about Angola. He wants to change that.

Reilly has been with PGI USA for the last 20 years, leading partnership development and professional education.

Boucheron reached record sales while Pomellato found success in its signature collections.

She was one of more than 120 American designers who created flags for the “United Flags of Fashion” project led by CFDA and Vogue.

Smith reveals the method The Retail Smiths use to help retailers and vendors write better job postings.

LVMH’s jewelry and watch brands outperformed the company’s other divisions in an environment the company described as “disrupted.”

“Sacred Heart” features symbols like crosses, angel wings, the Star of David, and the evil eye as a representation of coexistence.
The scholarships will go to early-career professionals looking to study gemology, bench work and jewelry design, or store operations.

Bain & Company delved into the trends shaping the luxury market, the impact of AI, and more in its recent study.

The exhibition reveals the gemology, geology, and cultural history of the iconic red gemstone.

The new sweeping slate of tariffs impacts 60 countries, including India, China, Thailand, Hong Kong, and the United Arab Emirates.

From coin pendants to diamond shields, these old world-inspired jewels are the perfect accessory for an epic journey.

Our Piece of the Week pairs a checkerboard-cut amethyst with an ivy green silk cord.

Mildred Marcano Abrams and Yael Reinhold join the podcast to talk community connections, holiday plans, and preserving Reinhold’s legacy.

Production also was up in the first half of 2026 but is expected to “substantially” decrease in H2 as two key mines undergo maintenance.

“Art Deco” fuses ancestral techniques, rare materials, and modern perspectives as a tribute to the optimism and curiosity of the movement.

The jeweler’s newest store is inside Arkansas’ Saracen Casino Resort.
























