A gem color largely depends on its chemical composition and crystalline structure. Different gemstones contain element traces in varying amount which lend them a unique colour. The colour of different types of gemstones is so enormous that no exact term defines every individual tone.
A gemstone certificate is a document that evaluates gemstones based on different quality parameters. It is issued by licensed gemological laboratories. While certain certificates verify authenticity & weight, others (for example in the case of diamonds) can specify color and clarity grades.
A gemstone (also called a fine gem, jewel, precious stone, or semiprecious stone) is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments.
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