The Oppenheimer Blue sold on Wednesday for more than $57.5 million including fees at a Christie's auction in Geneva, making it the most expensive diamond ever sold.

Californium, a metal first synthesized in 1950, is the world's most expensive material due to its extreme rarity and its applications in medicine, industry and security. The metal, first synthesized ...

The mine accounted for more than 90 percent of the global supply of pink diamonds. Among the 10 most expensive diamonds ever sold in the world, pink diamonds account for half the list. All five of ...

Meline: A pearl is one of the most ... diamonds need to fall in a specific shade, between C4 and C6, on the industry's color scale, which is more of a milk than a dark chocolate. More from So ...