A gemstone or gem also called a precious or semi-precious stone or jewel is a piece of mineral which in cut and polished form is used to make jewelry or other adornments.However certain rocks, such as la pis lazuli and organic materials such as amber or jet are not minerals, but are still used for jewelry and are therefore often considered to be gemstones as well.
Tuesday, March 20, 2012
DUMORTIERITE
A deep blue stone, with occasional small traces of grey to cream inclusions (most bead related items are made from Dumortierite aggregate, rather than Dumortierite crystal). The aggregate is equivalent to quartz in hardness, though.
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