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https://www.gemsociety.org/article/hardness-and-wearability/
A 7 or higher on the Mohs scale usually indicates a gem is hard enough for normal jewelry use. This is a guideline, not a hard and fast rule. Pearls and opals are some of the most popular jewelry gems but are well below 7. Wearability can be graded as Excellent, Very Good, Good, Poor, or Display Only.
https://www.gemselect.com/gem-info/gem-hardness-info.php
Jul 05, 2019 · More germane to this discussion of gemstone hardness though, is the reason why sapphire and ruby (of the same family, Corundum) are so highly recommended for everyday wear jewelry, such as rings and bracelets – they are tough as nails!
https://en.wikipedia.org/wiki/Gemstone
A gemstone (also called a gem, fine gem, jewel, precious stone, or semi-precious stone) is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks (such as lapis lazuli and opal) and occasionally organic materials that are not minerals (such as amber, jet, and pearl) are also used for jewelry and are therefore often ...
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