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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
All gems are minerals, but not all minerals are gems. In order for the mineral to be classified as a gem, the mineral must have very specific qualities. Minerals are judged on â¦ the following: beautydurabilityrarityportability and among other things.. Submitted answer does not answer the question nor is it correct.