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Christie’s to Auction ‘Mellon Blue’ Diamond for Up to $30M in Geneva

The 9.51-carat fancy vivid blue diamond, once owned by Bunny Mellon, will headline the Magnificent Jewels sale this November.

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Christie’s will offer a rare and historic blue diamond in its upcoming Magnificent Jewels sale on November 11, with the exceptional stone estimated to fetch up to $30 million.

Known as the Mellon Blue, the jewel features a 9.51-carat, pear-shaped, fancy vivid blue diamond, graded internally flawless — one of the highest accolades for clarity and color in the diamond world.

The diamond was once owned by Rachel Lambert “Bunny” Mellon, the American philanthropist, art collector, and noted horticulturalist whose garden designs can be seen at both the White House and the Palace of Versailles. Mellon, heiress to the Gillette fortune, was known for her refined taste and cultural influence.

Previously set in a pendant, the diamond was sold at Sotheby’s in 2014 for $32.6 million, where it set a then-world record for a blue diamond. It has since been recut to enhance its clarity, and is now being presented in a newly designed ring setting for this sale.

“This stunning fancy vivid blue diamond, which once belonged to America’s ‘Garden Queen,’ is among the finest colored diamonds ever to come to market,” said Rahul Kadakia, International Head of Jewelry at Christie’s. “After a very strong first half for Christie’s jewelry department, we look forward to the second half of 2025 with great confidence.”

Ahead of the auction, Christie’s will preview the Mellon Blue in Saudi Arabia, Shanghai, Hong Kong, Bangkok, and New York, allowing collectors and connoisseurs around the world a rare glimpse at one of the most exquisite colored diamonds to appear at auction in recent years.

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Belgian Prime Minister Bart De Wever opens expanded HRD Antwerp laboratory in Mumbai

HRD Antwerp is increasing its research capacity in Mumbai by 30%. The official opening, which takes place as part of a two-day visit by Prime Minister Bart De Wever to India, marks an important next step in the growth of HRD Antwerp in India

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 In the presence of Belgian Prime Minister Bart De Wever, HRD Antwerp, Europe’s leading authority in diamond and jewellery grading and a subsidiary of the Antwerp World Diamond Centre (AWDC), officially opened its renovated and significantly expanded laboratory in the Bandra Kurla Complex (BKC) in Mumbai, India. Thanks to the expansion, HRD Antwerp is increasing its research capacity in Mumbai by 30%. The official opening, which takes place as part of a two-day visit by Prime Minister Bart De Wever to India, marks an important next step in the growth of HRD Antwerp in India, one of the world’s leading centres for the trade and cutting of natural diamonds.

For HRD Antwerp, a grading report is not an administrative document but a guarantee of trust, transparency and authenticity. As an independent, neutral party between science, industry and consumer, HRD Antwerp is a worldwide guarantor of objective and reliable diamond and jewellery grading, a principle the organisation has upheld since its founding. HRD Antwerp was established in 1973 and has been active in India since 2012. Today it serves around 1,500 clients there, including jewellery manufacturers and retailers, as well as companies that produce and trade cut diamonds.

The Indian branch now accounts for 59% of HRD Antwerp’s total group revenue and is expected to grow by 15.4% this year, compared with a projected growth of 12.6% for the group as a whole. Jewellery grading is an important growth driver in this respect: as much as 47% of HRD Antwerp’s total revenue increase comes from that segment.

“As the authority in grading reports for natural diamonds and diamond jewellery, and in research into natural diamonds, we are already firmly established in India today”, says Paul De Wachter, CEO of HRD Antwerp. “India remains the world’s most important centre for diamond cutting. For a diamond laboratory such as HRD Antwerp, which provides cut natural diamonds with an independent and objective grading report, it is therefore essential to keep investing in this market.”

 Thanks to the expansion, HRD Antwerp in Mumbai can now examine and grade up to 2,000 diamonds per day, a capacity increase of 30%. To support this additional capacity, HRD Antwerp is recruiting 40 additional employees to work full time. The investment underlines HRD Antwerp’s confidence in the Indian market and strengthens the longstanding cooperation between Belgium and India within the international diamond and jewellery sector.

During the opening, Prime Minister Bart De Wever was given a tour of the renovated office.  He was shown the diamond grading process and was able to examine a diamond up close himself using a microscope. The demonstration was provided by HRD Antwerp’s Indian experts.

Alongside the Prime Minister, also present were Paul De Wachter, CEO of HRD Antwerp, Ramakant Mitkar, Managing Director of HRD Antwerp India, Chirag Shah, Vice Chairman of AWDC, Didier Vanderhasselt, Belgian Ambassador to India, and Frank Geerkens, Consul General of Belgium in Mumbai.

Paul De Wachter, CEO of HRD Antwerp: The visit of our Prime Minister underlines the importance of cooperation between Belgium and India within the global diamond sector. India and Antwerp together form two indispensable links in the international diamond chain. With this expansion, we are investing not only in additional capacity, but above all in the future of our cooperation with the Indian diamond and jewellery sector.”

Bart De Wever, Prime Minister of Belgium wrote the following message in HRD Antwerp’s guestbook during his visit: ” Sicut adamas fulget, ita fiducia inter gentes monet.  As a diamond shines, so trust endures between nations “

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JewelBuzz is Asia’s First Digital Jewellery Media & India’s No.1 B2B Jewellery Magazine, published by AM Media House. Since 2016, we’ve been the trusted source for jewellery news, market trends, trade insights, exhibitions, podcasts, and brand stories, connecting jewellers, retailers, and industry professionals worldwide.

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