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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
Gems are usually clearer, rarer, and more beautiful than other minerals. Color, luster and hardness are also important qualities that can set gems apart from other minerals. But thereâs no hard and fast rule as to which minerals cut it as gems and which donât. Itâs mostly a matter of custom.