Gemstone, any of various minerals highly prized for beauty, durability, and rarity. A few noncrystalline materials of organic origin (pearl, red coral, and amber) also are classified as gemstones. Assortment of gems. Gemstones have attracted humankind since ancient times, and have long been used for jewelry..
A gemstone is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks and occasionally organic materials that are not minerals are also used for jewelry and are therefore often considered to be gemstones as well.
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