Some of Leibish & Co.'s fancy colored diamonds used for the World of Color guide. Leibish & Co., unveiled its World of Colors guide for identifying fancy colored diamonds in New York Thursday ...

Sotheby's blockbuster single-lot sale of a 102.39-carat D color flawless diamond just sold in Hong Kong for $15.7 million without reserve.

Only seven D color flawless (or internally flawless) diamonds weighing more than 100 carats had ever appeared at auction before Monday’s sale, according to Sotheby’s.

A natural 2-carat, round-cut diamond with a high-quality color and clarity rating costs about $13,000-14,000, whereas the equivalent lab-grown diamond sells for about $1,000, according to Sompura.

The auction comes six months after Christie's sold "The Rock" — a 228-carat egg-sized white diamond billed as the largest of its kind to go up for auction — for more than $21.75 million ...

Pink diamonds are extremely rare and coveted. But a discovery made in Western Australia near a now-closed mine may help reveal new deposits of the jewels, researchers say.