Sotheby’s Geneva to Offer Rare 6.03-Carat Fancy Vivid Blue Diamond Ring
Sotheby’s Geneva is leading with a 6.03-carat Fancy Vivid Blue diamond ring that could command up to $12.2 million, a sharp test of demand at the top end.
Sotheby’s Geneva is putting a 6.03-carat Fancy Vivid Blue diamond ring at the center of its High Jewelry sale, and the price target is as rarefied as the stone itself: as much as CHF 9.5 million, or $12.2 million. The ring, set in platinum and cut as a cushion-modified brilliant, carries the kind of technical pedigree that collectors read as value, not ornament. It is Internally Flawless, classified type IIb, and accompanied by a GIA report dated February 10, 2025 confirming its Fancy Vivid Blue, Natural Colour status.
The lot is scheduled for Sotheby’s Geneva High Jewelry sale on May 12, 2026, at 14:00 CEST, with the exhibition and sale window running from April 29 to May 12. Sotheby’s has made it the headliner, and for good reason: natural blue diamonds are among the scarcest objects in the jewelry market. Sotheby’s says only 0.3 percent of all diamonds display a predominantly blue color, while a separate blue-diamond feature from the house puts natural blue diamonds at less than 0.02 percent of all mined diamonds. In a category where color is destiny, that scarcity does most of the economic work.
The stone’s type IIb classification sharpens the story further. Gemological Institute of America research has shown that the overwhelming majority of natural-color blue diamonds are type IIb, a category associated with boron and prized for the intensely saturated blues that collectors chase. Sotheby’s says the diamond also originated from the Cullinan mine in South Africa, a provenance that adds another layer of desirability for buyers who value both geological rarity and celebrated source.
The estimate itself shows how firmly blue diamonds remain positioned at the ultra-high end of the market. Sotheby’s publishes a range of CHF 7.2 million to CHF 9.6 million, about $8.0 million to $10.7 million, which works out to roughly $1.33 million to $1.77 million per carat. Rapaport pushed the ceiling higher, saying the ring could bring as much as CHF 9.5 million, or $12.2 million. That pricing sits in the same territory as the Mediterranean Blue, a 10.3-carat Cullinan-origin Fancy Vivid Blue diamond Sotheby’s Geneva sold for $21.5 million in May 2025 after an estimate of about $20 million.
That result matters. It showed that when a blue diamond combines vivid color, size, flawless clarity, and a clean paper trail, the market will still meet the asking range with force. This 6.03-carat ring has the same ingredients, only in a more compact, intensely jewel-like form, and it arrives at a moment when the best blue diamonds continue to set the benchmark for rarity, liquidity, and prestige.
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