The Blue Moon DiamondNamed because such exceptional stones are only found once in a blue moon, the s
The Blue Moon DiamondNamed because such exceptional stones are only found once in a blue moon, the stone displays a very deep shade of boron induced azure that was graded by the Gemological Institute of America as Fancy Vivid blue (without the usual grey colour modifier), and internally flawless. It was mined in one of the oldest mines in the world in January 2014, the Cullinan mine in South Africa, that has traditionally produced some large and beautiful stones, including the whoppers from the biggest stone ever that grace the British crown jewels. It is famed for blue stones, which represent a mere 0.1% of production.De Beers sold the mine on, and the recovery methods were changed to allow more large stones to pass through the grinding mill. Like many blue stones, it glows phosphorescently in UV light (continues glowing after the exciting light is switched off) a deep orangey red for an exceptional 20 seconds (see our past post on glowing diamonds for an explanation at http://on.fb.me/1GPmnMy) attesting to the depth and purity of the colour.The rough stone weighed 29.62 carats, and the resulting cushion cut gem 12.03 carats, measuring 15.57x13.47x7.55mm.LozImage credit: Cora Diamonds.http://www.gia.edu/gems-gemol…/winter-2014-blue-moon-diamondhttp://www.forbes.com/…/rare-12-carat-blue-moon-diamond-to…/ -- source link
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