With historic roots and a royal Indian legacy, the 23 carat Golconda Blue diamond is the largest fancy blue diamond ever put up for auction.

"Diamonds that fall beyond Z on the color scale are considered fancy colored ... "Their rare occurrence carries a lot of weight. Red, blue, pink, and green are incredibly special for that reason.

A rare blue diamond was displayed at an exhibition of $100 million worth of the world’s rarest diamonds in the United Arab Emirates’ capital ABU DHABI, United Arab Emirates -- A rare blue ...