Historically, gems have been divided into precious and semiprecious classes. There are a number of semiprecious gems, many quite beautiful, but diamonds, rubies, sapphires, and emeralds continue ...

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 ...

whether that's a common stone or a precious white diamond. Ready to try? These are some of the best places in the U.S. to prospect for gold or gemstones. Nearest city: La Sal What to look for ...