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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
What qualities must a mineral possess in order to be considered a gem? 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. All Gems are not minerals. A Gem is a piece of rock or mineral, which, in cut and polished form, is used to make jewelry or other adornments.