In 2016, Sotheby's sold a Fancy Vivid Blue diamond Cartier ring for about $19.5 million in 2016. The center fancy vivid blue diamond weighed 8.01 carats. The incredible stone has been named 'The Sky Blue Diamond', emphasising its highly sought-after hue.

'The Sky Blue Diamond' has been graded Fancy Vivid Blue by the Gemological Institute of America (GIA) – the highest possible colour grading, awarded to no more than 1% of blue diamonds submitted to the GIA. It was also found to have excellent polish and to be of Type IIb, a rare category which represents less than 0.5 % of all diamonds. Describing the diamond, David Bennett, Worldwide Chairman of Sotheby's International Jewellery Division, said, "The Sky Blue Diamond Carter ring is of a wonderfully clear celestial blue, presented in an extremely elegant square emerald cut – in my view, the most flattering of all the cuts for a coloured diamond. This important gem will, I am sure, captivate all collectors of exceptional gemstones."

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