Large crystals found in geodes and other rocks are relatively rare. Pink ChalcedonyA pink chalcedony shows off its beauty. Chalcedonies include many types of cryptocrystalline quartz gems and ...

While crystals and gemstones are often admired for their beauty and healing properties, there’s a darker side to some of these treasures from the Earth. Not all crystals are harmless—some can ...

Gemstones, including rubies, emeralds, and sapphires, can be sold for cash, much the same as diamonds and other jewelry.