| http://www.w3.org/ns/prov#value | - A gemstone or gem (also called a precious or semi-precious stone) is a piece of attractive mineral, which??when cut and polished??is used to make jewelry or other adornments.[1] However certain rocks, (such as lapis-lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry, and are therefore often considered to be gemstones as well.
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