gemstone

A gemstone is a naturally occurring stone that's highly valued for its beauty and rarity. These stones are often used in jewelry.

You might hear people talking about their grandmother's diamond ring being made from a precious gemstone, or see an advertisement for a necklace featuring a sapphire gemstone as the centerpiece. In both cases, the word is used to refer specifically to something that comes from nature, not something man-made like a fake stone. The type of gemstone might give clues about the value and beauty – rubies are often associated with luxury, while opals have a more mystical feel.