Gems, Precious Stones, Precious Metals Colors in Hex for Web Pages
A gemstone or gem (also called a precious or semi-precious stone, a fine gem,
or jewel) is a piece of mineral, which, in cut and polished form, is used to
make jewelry or other adornments. However certain rocks (such as lapis lazuli),
or organic materials that are not minerals (such as amber or jet), are also
used for jewelry, and are therefore often considered to be gemstones as well.
Most gemstones are hard, but some soft minerals are used in jewelry because of
their luster or other physical properties that have aesthetic value. Rarity is
another characteristic that lends value to a gemstone.
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