A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments.

Gemstones come in a wide variety of colors, shapes, and sizes, and are formed from minerals or organic materials. Some of the most popular gemstones include diamonds, rubies, sapphires, emeralds, and pearls. These gemstones have been highly prized for centuries and are still highly sought after today.