Of the more than 2 000 identified natural minerals fewer than 100 are used as gemstones and only 16 have achieved importance. Gemstone any of various minerals highly prized for beauty durability and rarity. Among the most highly valued gemstones are diamonds emeralds rubies and sapphires. The gems of the orthopyroxene series are usually very dark slightly brittle because of cleavage and generally not. Green and brown gems from india and brazil tend to be in the bronzite composition range.
A few noncrystalline materials of organic origin such as pearl and amber also are classified as gemstones. Each precious stone page features additional detailed gemological information a buyer s guide photos videos research. The brown and green gems from tanzania are enstatites as are the brownish green stones from sri lanka. A gemstone also called a gem fine gem jewel precious stone or semi precious stone is a piece of mineral crystal which in cut and polished form is used to make jewelry or other adornments. A few noncrystalline materials of organic origin such as pearl and amber also are classified as gemstones.
A gemstone also called a gem fine gem jewel precious stone or semi precious stone is a piece of mineral crystal which in cut and polished form is used to make jewelry or other adornments. Of the more than 2 000 identified natural minerals fewer than 100 are used as gemstones and only 16 have achieved importance.
