By Brecken Branstrator
This 3.81-carat oval-cut fancy intense blue diamond is expected to be the top lot at Bonhams’ Sept. 20 Fine Jewellery sale in London.
This 3.81-carat oval-cut fancy intense blue diamond is expected to be the top lot at Bonhams’ Sept. 20 Fine Jewellery sale in London.

London--When Bonhams London kicks off its autumn auction season next month, it will do so with a number of high quality blue stones.

Leading the Fine Jewellery sale, which is scheduled for Sept. 20, will be an oval-cut 3.81-carat fancy intense blue diamond. Coming from a private British collection, the stone is expected to sell for $1.7 million to $2.4 million.

Bonhams currently holds the price-per-carat world auction records for both a fancy deep blue diamond ($1.77 million per carat) and a fancy grayish-blue diamond ($730,000 per carat).

Also topping the London sale is a pair of earrings featuring cushion-shaped Kashmir sapphires weighing just under 9 carats surrounded by old brilliant-cut diamonds. The earrings are expected to garner as much as $790,000.

An 11-carat marquise-cut diamond set in a six-claw ring and a 13.77-carat brilliant-cut diamond ring from J. Roca both have a pre-sale high of $330,000.

Other lots expected to top the sale include a pair of sapphire and old brilliant-cut diamond earrings ($200,000 to $260,000) and a necklace and earrings suite featuring cabochon rubies and diamonds. It could garner between approximately $130,000 and $200,000.

Additional highlights include an 18.77-carat oval-cut Sri Lanka sapphire ring with a brilliant-cut diamond border and pave-set diamond shoulders, estimated to garner as much as approximately $110,000.

A 12.50-carat Colombian emerald and diamond cluster ring circa 1960 also will go up on the block at the auction house’s New Bond Street salesroom next month, with a pre-sale estimate high of $53,000, as will diamond pendent earrings circa 1830 weighing 3.02 and 3.25 carats, E and F in color and Type IIa clarity. They have a pre-sale range of $40,000 to $53,000.

Bonhams’ London jewelry sale also will include signed pieces from Harry Winston, Cartier, Van Cleef & Arpels, Tiffany & Co., Chaumet, Boucheron and Hemmerle.

The full list of items to be auctioned at the upcoming sale, which has 125 total lots, can be found on

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