DiamondBuzz
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.

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.

DiamondBuzz
De Beers brings Diamonds and Glamour to London

Insiders suggest a star-studded journey to London might be on the cards. But why London? Beyond its glittering reputation as a global hub for jewellery and fashion, whispers point to something far more dazzling — De Beers is set to host a major showcase in the city.
This year, De Beers Group makes its grand debut at Frieze London, marking a landmark moment where the world of natural diamonds meets the world of art. In collaboration with Frieze Masters, the brand will unveil Voyage Through the Diamond Realm — an immersive experience said to capture the mystery, beauty, and brilliance of natural diamonds like never before.
To bring this vision to life, De Beers has invited India’s leading style and art connoisseurs, including Twinkle Khanna, Ananya Panday, Sara Tendulkar, Karan Johar and many more. Known for their refined taste and appreciation of art and design, these tastemakers are the perfect ambassadors to experience natural diamonds in a whole new light — where every facet tells a story of time, pressure, and perfection.
While details remain under wraps, those close to the brand hint that the experience will be nothing short of transformative — a moment where science, storytelling, and rarity converge to celebrate nature’s most extraordinary creations.
One thing’s certain: when De Beers Group meets Frieze London, the city is bound to shine a little brighter — and perhaps, so will those boarding that flight.
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