Christie’s brings largest fancy blue diamond ever to auction in New York

Christie’s will place a 31.62-carat pear-shaped fancy blue diamond called The Azure Blue under the lights at Rockefeller Center on June 9, and it arrives with a $6.5 million to $8.5 million estimate that signals more than just size. The house says it is the largest fancy blue diamond ever offered for sale at auction, a distinction that gives the stone trophy status before the bidding even begins.

The appeal here is not only carat weight. Christie’s describes the diamond as a natural-color fancy blue with exceptional uniformity of color, while Forbes says it carries Type IIb chemistry and VVS1 clarity. That combination matters because GIA says the overwhelming majority of natural-color blue diamonds are Type IIb, and blue stones with strong clarity are especially scarce. Robb Report added that GIA graded the stone as potentially internally flawless, a detail that could lift it from VVS1 to IF and sharpen collector demand further.

Blue diamonds at this scale rarely enter the market at all, which is why the June sale is being positioned as a landmark. De Beers Group said in 2022 that only five blue diamonds of 10 carats or more had ever come to auction at that point, and none exceeded 15 carats before the 15.10-carat De Beers Blue sold for $57.5 million in Hong Kong. Christie’s itself sold the 35.56-carat Wittelsbach-Graff Diamond in 2008, later recut to 31.06 carats, and the 14.62-carat Oppenheimer Blue still holds the auction record for a blue diamond at $57.6 million in 2016.

Azure Blue will also share the sale room with another important blue stone, a 5.04-carat fancy vivid blue diamond, underscoring Christie’s push to frame this auction as a concentrated moment for collectors rather than a single-lot spectacle. The diamond is being offered in collaboration with The Fine Art Group, and that pairing should help drive the kind of cross-border attention that top-color stones attract when rarity, grading, and timing align.

For a buyer thinking in milestones rather than categories, this is the sort of diamond that sits at the summit: large enough to command headlines, rare enough to matter to the market, and blue enough to remain one of the most coveted color grades in jewelry. If the final number climbs, it will likely be because the stone’s scale, clarity potential, and museum-level color combine into the kind of one-off lot that only appears when the market is ready.