December 12, 2019

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Sotheby’s Geneva Auction on November 11, 2015: The Blue Moon Diamond

Sotheby’s upcoming Geneva sale of Magnificent Jewels and Noble Jewels will include finest quality examples in every category of jewellery, led by the superlative Blue Moon Diamond, a 12.03-carat stone boasting internally flawless clarity and truly outstanding colour.

The rough diamond which yielded the Blue Moon was discovered by Petra Diamonds (owners of the famous Cullinan Mine in South Africa) in January 2014. The magnificent rough was purchased through a competitive tender by New York-based Cora International, considered one of the world’s leading firms specializing in cutting large and important diamonds. Cora has cut and polished the Blue Moon – a highly skilled and complex process which took over six months. The Blue Moon Diamond’s name refers to the expression ‘once in a blue moon’, which is used to describe something which happens only extremely rarely. The stunning diamond comes to the market with an estimate of CHF 34.2 – 53.7 million ($35-55 million) (LOT 513).

The sale on 11 November will also offer further exceptional coloured diamonds, precious jewels combining illustrious provenance with the most highly coveted physical characteristics and signed jewels displaying the finest design and workmanship of houses including Cartier, Van Cleef & Arpels, Chaumet and JAR.

Looking ahead to the sale, David Bennett, Worldwide Chairman of Sotheby’s International
Jewellery Division, commented: “The superb “Blue Moon Diamond”, named for its utter rarity, is a
simply sensational gem of truly extraordinary colour and perfect purity. We are also thrilled to be
offering the unique “Queen Maria-José Ruby Ring” – of sumptuous “pigeon’s blood” colour and with
a fascinating royal provenance – not to mention an absolutely superb fancy vivid purple-pink
diamond weighing 8.24 carats. In addition to diamonds and coloured gemstones of the highest order,
the upcoming sale includes three captivating tiaras with noble provenance, as well as a wonderful
ensemble of signed jewels from the world’s greatest designers.”.


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