Sotheby’s June high jewelry sale led by rare blue diamond, Harry Winston piece
A 10.02-carat fancy intense blue diamond and a 1960s Harry Winston detachable jewel will headline Sotheby’s New York high jewelry sale.
A 10.02-carat fancy intense blue diamond with VS2 clarity will anchor Sotheby’s June 16 High Jewelry sale in New York, and its rarity is the kind that seasoned buyers measure in headlines, not just carats. Sotheby’s says it is only the third 10-carat-plus fancy intense blue diamond offered at auction since 2008, a size-and-color combination that puts the stone in a very small class of its own.
The diamond is an unmounted cut-cornered rectangular modified brilliant, estimated at more than $6 million. That detail matters. Unmounted stones give collectors the purest read on the gem itself, while the cut-cornered rectangular shape and modified brilliant faceting suggest a modern, crisp outline rather than a romantic antique silhouette. Sotheby’s will also offer the winning bidder a Sotheby’s Bespoke opportunity, letting the buyer set the stone into a custom jewel instead of inheriting someone else’s design language.
The blue diamond arrives with an auction-market benchmark already attached to its color family. Sotheby’s sold the 10.03-carat Mediterranean Blue for $21.5 million in Geneva in May 2025, a recent reminder that top blue diamonds can move from rare to market-defining in a single hammer drop. That comparison is the share hook here: if the June stone approaches that level of intensity, the lot will not simply be glamorous, it will be one of the few blue-diamond events collectors track across years.
The sale’s other star is a circa-1960s Harry Winston detachable necklace-bracelet combination estimated at $800,000 to $1.2 million. The jewel measures about 15 1/2 inches long and breaks into four sections, roughly 6 3/4, 3 1/2, 3 3/8, and 2 inches, so it can be worn as two bracelets or as a necklace of varying lengths. Sotheby’s says it carries maker’s marks for François Tavernier, is numbered, comes with a signed box, and holds more than 120 carats of diamonds. In vintage-jewelry terms, that is a strong cocktail of provenance, flexibility, and wearability.
Harry Winston founded his namesake brand in 1932 and built its reputation on legendary stones like the Hope Diamond and the Jonker Diamond, then on the Winston Cluster style introduced in the 1940s. This piece shows a slightly different emphasis, with graduated pairs of round diamonds alternating with marquise-shaped clusters, a composition that lets the stones dictate the form. Round diamonds are more prominent here than in the house’s usual marquise-and-pear cluster language, which gives the jewel a sharper mid-century profile and makes it especially interesting to collectors who prize signed design with a clear period stamp.
Sotheby’s June High Jewelry catalog will total 118 lots, spanning storied collections and major signed jewels from houses including Cartier and Van Cleef & Arpels. For buyers reading the room, the message is clear: this is not just a sale filled with sparkle, but a test of how far rarity, design pedigree, and a blue diamond of exceptional size can still pull the market upward.
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