gem stone

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Definition of gem stone in English English dictionary
gemstone: a crystalline rock that can be cut and polished for jewelry; "he had the gem set in a ring for his wife"; "she had jewels made of all the rarest stones"
gemstone: a gem, usually made of minerals
gemstone: {i} gem, jewel, precious stone
gemstone: A gemstone is a jewel or stone used in jewellery. = gem. Any of various minerals prized for beauty, durability, and rarity. A few noncrystalline materials of organic origin (e.g., pearl, red coral, and amber) also are classified as gemstones. Of the more than 3,500 identified natural minerals, fewer than 100 are used as gemstones and only 16 have achieved importance: beryl, chrysoberyl, corundum, diamond, feldspar, garnet, jade, lazurite, olivine, opal, quartz, spinel, topaz, tourmaline, turquoise, and zircon. Some of these (e.g., beryl and corundum) provide more than one type of gem. In virtually all cases, the minerals have to be cut and polished for use in jewelry