Sotheby’s blue diamond fetches $8.7 million in New York sale
A 10.02-carat fancy intense blue diamond led Sotheby’s New York sale, bringing $8.7 million and signaling the rarefied market for top-tier colored stones.
A 10.02-carat fancy intense blue diamond, cut in a rectangular modified brilliant and left unmounted, became the night's defining object at Sotheby’s New York High Jewelry sale, bringing $8.7 million and emerging as the top jewel sold in New York across auction houses this year. The stone cleared its $6 million high estimate with room to spare, a result that showed how little room there is at the top of the market for anything less than exceptional color and pedigree.
Sotheby’s identified the diamond as VS2 clarity and said it carried a Gemological Institute of America report dated May 28, 2026, along with a GIA letter stating that it had been determined to be Type IIb. That classification matters in the blue-diamond world because it puts the stone in a very small and coveted category. Sotheby’s said it was only the third fancy intense blue diamond of 10 carats or more to reach auction since 2008, which helps explain why this sale drew so much attention from collectors who value rarity as much as size.
The June 16 sale included 119 lots and closed at $43.4 million, with 98% of the pieces sold and 63% finishing above their high estimates. Those numbers point to a market that is still willing to stretch for the right stones, especially in the colored-diamond segment where visual impact and scarcity do most of the work. A fancy intense blue diamond of this scale is not just another high-jewelry headline piece; it is a status marker with very few peers, whether it is showcased alone or mounted into a one-off collector jewel.
Other lots reinforced that strength. A 5.02-carat fancy intense pink and light pink diamond ring, featuring an oval-shaped pink center stone flanked by pear-shaped light pink diamonds weighing 0.44 and 0.42 carat, carried a $2 million to $3 million estimate and later sold for $2.9 million. Sotheby’s also showed the sale publicly at 945 Madison Avenue in New York, where the exhibition offered a close look at the sort of stones that sit at the top of the hierarchy: rare in color, precise in cut, and impossible to mistake for anything ordinary.
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