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...various countries. In addition [[hardstone carving]] uses many types of [[gemstones]].

...jewelry, and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their [[Lus ...pp.3-8 ISBN 0972822380</ref> Another unscientific term for semi-precious gemstones used in [[art history]] and [[archaeology]] is [[hardstone]]. Use of the t

...e three [[cleavage (crystal)|cleavage planes]], just as other minerals and gemstones have. But in their case, there are two cleavage planes that are much weaker

...is found naturally only combined with other elements in minerals. Notable gemstones which contain beryllium include [[beryl]] ([[Aquamarine (gemstone)|aquamari