Sotheby’s lists 5.72-carat Kashmir sapphire ring, estimate £180,000

A 5.72-carat Kashmir sapphire ring has become one of the most closely watched lots in Sotheby’s London Fine Jewelry sale, not because it is the biggest stone in the room, but because it sits in the sweet spot where provenance, condition and setting do the heavy lifting. Listed as Lot 185, the ring carries an estimate of £120,000 to £180,000, and had already reached a current bid of £120,000 when catalogued.

The stone is a cushion-shaped sapphire, framed by brilliant-cut diamonds in a classic surround that lets collectors judge the gem on the qualities that matter most: color, cut, origin and mount style. Sotheby’s has paired the ring with an SSEF report dated February 24, 2026, and a Gem & Pearl report dated November 21, 2025. Both identify the sapphire as Kashmir origin with no indications of heating, the combination serious buyers prize most in this category.

That documentation matters because Kashmir sapphires occupy a very narrow and coveted lane in the market. Sotheby’s says the mines were most successful between 1882 and 1887, and later attempts to revive production yielded minimal results. The scarcity of untreated stones with documented origin has turned Kashmir into a byword for rarity, especially when the gem tops 5 carats. Sotheby’s says any sapphire above that threshold is cause for celebration among connoisseurs, which helps explain why this 5.72-carat ring draws attention even against flashier headline lots.

The comparison with larger stones makes the market logic clearer. Christie’s said in March 2025 that The Regent Kashmir, a 35.09-carat Kashmir sapphire ring, was the most valuable piece of Kashmir sapphire jewellery it had offered globally in the previous five years, with an estimate of HK$65 million to HK$95 million. Sotheby’s has also pointed to an 8.18-carat Kashmir sapphire ring that sold for $5.1 million in 2014. In November 2025, Christie’s reported that The Royal Blue, a 35.09-carat Kashmir sapphire necklace, sold in Hong Kong for HK$125,450,000 and set a world auction record for a Kashmir sapphire necklace.

Against those numbers, Sotheby’s London ring sits at the attainable end of top-tier Kashmir collecting, where a disciplined mount, strong reports and a respected origin can matter as much as size. The broader London sale runs from May 20 to June 3, 2026, with 225 lots spanning jewels from the 19th century, the Belle Époque, Art Deco, bold mid-20th century design and contemporary pieces from major houses. In that field, Lot 185 stands out as a study in what seasoned collectors actually buy: not just carats, but credibility.