"Mandarin garnet" specimens are the most in demand and the most expensive. Spessartine gem quality stones are rarely larger ...

Blue diamonds are among the most rare and valuable gems on Earth, but up until now, scientists knew very little about them. The most famous blue diamond is the Hope Diamond, which was discovered ...

Rare 10-karat blue diamond from South Africa among $100M worth of gems up for auction A 15.1-carat fancy vivid blue diamond is projected to be auctioned for a whopping $48 million — the highest ...

Rare, hefty blue diamond found in South Africa; check out these gems 1 / 1 In 2003, the deep-blue Hope Diamond -- 45.52 carats -- is placed on a mirror at the Smithsonian’s Natural History ...

Saniniu Laizer, 52, recently discovered the rare, dark violet-blue tanzanite gem, weighing 14 pounds. Tanzanite is only found in northern Tanzania and is valued based on its rarity, color and clarity.

The rarest diamonds on Earth were forged hundreds of miles below its surface, scientists announced on Thursday. A team of geologists and gemologists from Australia and the U.S. analyzed 46 blue ...

An exceptionally rare blue gem became one of the most expensive diamonds sold by Christie’s when it went under the hammer in Geneva on Tuesday. An unidentified buyer paid CHF 39,505 million (US ...

A 15.1-carat blue diamond set to go on auction in April could fetch upward of $48 million, according to officials at Sotheby’s, the auction house handling the diamond. The De Beers Cullinan Blue ...