Blue Moon Diamond

A model holds a 12.03-carat blue diamond during a press preview by auction house Sotheby's in Geneva on November 4, 2015. A 12.03-carat blue diamond could fetch a record $55 million (47 million Euros) when it goes under the hammer by Sotheby's on November 11 in Geneva. Categorised as a fancy vivid blue diamond, the Blue Moon, discovered in South Africa in January last year, is the largest cushion-shaped stone in that category to ever appear at auction. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

Blue Moon Diamond, a sensational 12.03 carat stone, sold for $48.5 million at a Sotheby's auction in Geneva in November 2015.

The stone was bought by Hong Kong billionaire Joseph Lau as a gift for his daughter, who was seven years old at the time.

Related: Inside Sotheby's first ever 'Star Wars' auction

First published March 2, 2016: 6:29 AM ET

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