
Both rough Diamonds weight 117 carats and 110 carats are D color Type IIa diamonds.
Type IIa diamonds carbon bonds contain little or no nitrogen atoms making them very white and rare. These are the most expensive white diamonds.
Source: DCLA

Rare Imperial Russian jewels, including Catherine the Great’s diamonds, and a Faberge necklace from the reign of Nicholas II, are to be of...
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