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In addition, it must be hard and durable. Its value increases if it is also rare.The beauty of a gem is measured in terms of its clarity, brilliance, and color. Comments
This Key does not get that advanced, but the guides many collectors use often have this information in them. The main thing that needs to be considered in the identification of minerals is whether or not a sample has a cleavage â many minerals donât, breaking without producing smooth flat surfaces.