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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
That a high degree of hardness is not essential, however, to the employment of a mineral as a gem is shown by the extensive use of such substances as pearl, amber, jet, and turquois, for gems. All of these are easily scratched by ordinary objects.