A 5.5-carat triangular-cut diamond—billed as the largest fancy vivid blue-green diamond in existence—sold for $17.3 million at Christie's Geneva, setting a record for the classification and underscoring continued strength in colored-stone premiums. The sale closed this week without buyer identification, typical for the house's high-tier colored goods.
The stone carried the "fancy vivid" designation from the Gemological Institute of America, the highest saturation grade for colored diamonds. Blue-green diamonds at this size and grade are geological outliers; fewer than a dozen fancy vivid blue-greens over three carats have appeared at auction in the past two decades. The triangular cut—also called a trillion—is uncommon in stones above two carats, where cutters typically favor emerald or radiant shapes to maximize yield. Christie's lot notes did not disclose provenance or mining origin, which suggests either a recent discovery or a private collection with no resale history.
The $17.3 million hammer price translates to roughly $3.15 million per carat, a meaningful premium to the $2.8 million per carat average for fancy vivid blues sold in 2024. The spread reflects scarcity: blue-green hues occupy a narrow band in the GIA color spectrum, requiring trace boron with specific lattice distortions that deflect yellow wavelengths. Most boron-bearing diamonds skew pure blue or gray-blue. The premium also tracks wider colored-diamond strength; Sotheby's Hong Kong cleared a 10.57-carat fancy vivid pink for $34.8 million in October, and a 3.01-carat fancy vivid red sold privately in November for an undisclosed sum estimated above $40 million.
For allocators, the sale confirms two structural shifts. First, colored diamonds now trade as a separate asset class from white goods, with pricing driven by museum-quality rarity rather than bridal demand. Second, the buyer pool for eight-figure colored stones has deepened since 2020, led by Asian family offices and Middle Eastern sovereign wealth vehicles treating these assets as portable, liquid stores of value with no reporting requirements. The $17.3 million close also lands below Christie's undisclosed high estimate, which market participants expected near $20 million. That gap may reflect caution around triangular cuts, which face narrower resale demand than round or emerald shapes, or hedging against a stronger U.S. dollar, which pressures non-dollar luxury goods.
Watch for two follow-on events. Christie's Hong Kong holds its next Magnificent Jewels sale in late May, where consignors often place comparable goods after Geneva sets a benchmark. The house has not yet published the catalog, but industry sources expect at least one fancy vivid blue above two carats. Separately, the GIA has delayed publication of its 2024 colored-diamond grading volume, originally scheduled for mid-April. That report will show whether the number of fancy vivid certifications issued last year declined, which would validate scarcity premiums, or held steady, suggesting demand rather than supply drove the $17.3 million close.
The triangular cut sits in a vault now, likely Hong Kong or Geneva, its exact location undisclosed. The next time a blue-green fancy vivid of this size appears, the floor is set.
The takeaway
Christie's **$17.3M** blue-green sale sets a vivid classification record and confirms colored diamonds trade as a distinct asset class from white goods.
colored diamondschristiesluxury assetsrare gemstonesalternative stores of value
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