Gemstone (Gem) is described as precious or semiprecious stone that may be used as a jewel when cut and polished. It includes diamond, beryl, emerald, chalcedony, agate, onyx, tourmaline, chrysolite, sapphire, ruby, spinel, topaz, turquoise, zircon, cubic zirconia, jacinth, hyacinth, carbuncle, amethyst, alexandrite, cat's eye, bloodstone, hematite, jasper, moonstone, sunstone, and many others.
Coral and pearls and several organic materials are also considered gemstones.
See also:
"Gemstone" is in the UNSPSC Code "54000000"
Timepieces and Jewelry and Gemstone Products
Gemstone is described as a mineral, stone, or organic matter that can be cut and polished or otherwise treated for use as jewelry or other ornament.
A precious gemstone has brilliance, beauty, durability and rarity, whereas a semi-precious gemstone has only one or two of these qualities. Examples of gemstones are: amethyst, aquamarine, cultured pearl, garnet, opal, etc. All other gemstones are usually classed as semi-precious.
Diamonds, rubies, sapphires, emeralds, aquamarine, opal and topaz are generally classed as precious stones.
-see also:
"Gemstone" is in the UNSPSC Code "54000000"
Timepieces and Jewelry and Gemstone Products
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Cultured pearl (Cultured pearl is a gemstone described as ...)
Amethyst (Amethyst is a gemstone characterized as a ...)
Opal (Opal is a gemstone whose chemical composition is ...)
Aquamarine (Aquamarine a kind of gemstone described as ...)