a completely flawless gemstone, set a record in 2017 as the most expensive diamond ever sold at auction, selling for a whopping $71.2 million at a Sotheby's auction. The vividly pink diamond ...

Red diamonds lead the list as the most expensive diamonds in the world, valued at a staggering $1 million per carat. Found mostly in Sri Lanka and Tanzania, taaffeite is one of the rarest ...

Ever since then, it’s been known as CTF Pink ... indicating the impact and power rare gems have in the market.

Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones ... inside it that you've never, ever seen before. Narrator: Opal is ...

An exceptionally rare blue diamond went under the hammer in Geneva late Tuesday, selling for $21.5 million, Sotheby's auction ...