A 9.51-carat, pear-shaped, fancy-vivid-blue, internally flawless diamond ring, named the Mellon Blue, is poised to headline Christie’s Magnificent Jewels auction in Geneva on November 11, 2025. The ring is projected to fetch up to $30 million, as announced by Christie’s on Friday.
Historical Significance
Provenance: The diamond was previously part of a pendant owned by Rachel Lambert Mellon, also known as Bunny Mellon, a noted horticulturalist, philanthropist, and art collector.
Legacy: Mellon, daughter of Gillette president Gerard Barnes Lambert and granddaughter of Listerine inventor Jordan Lambert, was renowned for her garden designs at the White House and the Palace of Versailles.
Previous Sale: In 2014, the diamond, before being recut for enhanced clarity, sold for $32.6 million at Sotheby’s, setting a world record for a blue diamond at the time.
Auction Details
Event: Christie’s Magnificent Jewels auction, Geneva.
Date: November 11, 2025.
Estimated Value: Up to $30 million.
Pre-Auction Tour: The ring will be displayed in Saudi Arabia, Shanghai, Hong Kong, Bangkok, and New York.
Market Context
Rahul Kadakia, international head of jewelry at Christie’s, commented, “After a strong first half of 2025 for our jewelry department, we are excited to unveil the Mellon Blue, a stunning fancy-vivid-blue diamond with exceptional provenance. This gem is among the finest colored diamonds to be offered at auction.”
Significance
The Mellon Blue’s rarity, combined with its historical and cultural significance, positions it as a standout piece in the global luxury market, reflecting sustained demand for high-quality colored diamonds.
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