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2825 Sand Hill Rd
Menlo Park, CA, 94025

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Stephen Silver is renowned for our extraordinary ability to procure, design and handcraft the world's finest jewelry and gemstones.

The Stephen Silver Fine Jewelry Estate Collection includes some of the finest pieces from the Edwardian, Victorian, Art Deco, Art Nouveau, and Retro eras. Signed and period pieces are the company's specialty; many of which are from prestigious jewelry houses such as Cartier, Van Cleef & Arpels, Bulgari, Tiffany & Co., and Harry Winston.

The Stephen Silver Fine Jewelry Signature Collection exemplifies modern day luxury combined with old world elegance to produce true works of art. Exquisitely handcrafted in platinum and 18-karat gold, using only the very finest diamonds and colored gemstones, our Signature Collection is exceptional in quality and extraordinary in style.

'The Constellation' Sets Rough Diamond Price Record; 813-Carat Stablemate of 'Lesedi la Rona' Sells for $63M


'The Constellation' Sets Rough Diamond Price Record; 813-Carat Stablemate of 'Lesedi la Rona' Sells for $63M

Annena Sorenson

Back in November of 2015, Canada-based Lucara enjoyed an uncanny stroke of good luck when its workers discovered two enormous gem-quality rough diamonds at its Karowe Mine in Botswana. The pair tipped the scales at a combined 1,922 carats — or just shy of a 14 ounces.


The larger of the two — the 1,109-carat Lesedi la Rona — will be offered for sale at Sotheby's London on June 29. The smaller of the two — The Constellation — just set a record when the 813-carat gem was purchased by Dubai-based Nemesis International for $63.1 million. It was the highest price ever paid for a rough diamond.


The record is likely to be short lived because the Lesedi la Rona is expected to fetch at least $70 million in London. If Lesedi la Rona earns the same $77,649 per-carat as its Lucara stablemate, it is likely to garner upwards of $86 million.

Both diamonds have been rated Type IIa by the Gemological Institute of America. Diamonds in this rare and coveted subgroup are chemically pure and often show extraordinary optical transparency.


As part of the deal with Nemesis International, Lucara retained a 10% interest in the net profit from the sale of the faceted diamond (or diamonds) The Constellation will yield after cutting and polishing.

Lesedi la Rona is being billed by Sotheby's as "The Diamond of a Lifetime" because it's the biggest rough diamond to be unearthed in more than a century. Only the 3,016-carat Cullinan Diamond, discovered in 1905, was larger. The Constellation, at 813 carats, is the sixth largest gem-quality rough diamond ever found, according to

It's hard to imagine how improbable it was for Lucara to secure two such extraordinary diamonds within days of each other in the same area of a single diamond mine — in this case, the south lobe of the Karowe Mine.

Credits: Facebook/Lucara Diamond Corporation.