There are over 2,000 identified natural minerals. Of them, less than 100 are considered gemstones, and, of those, only 16 have any perceived importance or value. We’re going through some […] ...

Gemstones are valued based on the Four Cs - color, clarity, cut, and carat. Precious stones include diamonds, sapphires, rubies, and emeralds. Semi-precious stones are evaluated on their rarity ...

The most expensive gemstones from around the world provide a peek into bizarre mineral assemblages and alterations.