Auctions Sotheby's

Once in a Blue Moon


Blue is one of the rarest naturally occurring fancy colors of a diamond and many of the most memorable diamonds in history exhibit this icy blue hue. Arguably the most famous of all diamonds, not just fancy blues, is the legendary blue stone that nearly everyone in the world knows thanks to its equally famous history and to the movie Titanic, the Hope Diamond.

The Hope Diamond (Photo: The Smithsonian)

The Hope Diamond (Photo: The Smithsonian)


Another important blue that left an indelible mark on the jewelry industry was the sale of the Wittelsbach blue – a 31.06-carat fancy deep blue diamond formerly part of the Austrian and Bavarian Crown Jewels. This important stone was sold at Christie’s London in December 2008 and purchased by Laurence Graff for $23.4 million, at the time a record price for a diamond.


The Wittelsbach-Graff


The most recent blue diamond causing a wave of headlines was the Zoe Diamond, a 9.75-carat fancy vivid blue diamond formerly in the collection of the late Bunny Mellon. It holds the current record price for a fancy vivid blue diamond when it sold at Sotheby’s New York last November for $32.6 million, or $3.34 per carat.


The Zoe Diamond

Now, Sotheby’s just announced it has another important blue diamond in its arsenal for the autumn auction season, the Blue Moon Diamond. At 12.03 carats and deemed Internally Flawless by the GIA, this important stone is believed to be among the largest fancy vivid blues known and is estimated to fetch between $35 and 55 million. The fancy blue hue is due to trace amounts of boron scattered within the crystal matrix.

The Blue Moon Diamond (photo courtesy of Sotheby's)

The Blue Moon Diamond (photo courtesy of Sotheby’s)

The Blue Moon Diamond will be exhibited in Hong Kong (October 2-6), London (October 18-22) and New York (October 30 – November 1) before it is sold as part of Sotheby’s Magnificent Jewels and Noble Jewels sale in Geneva on November 11th.

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