Gemstone

Gemstones are generally minerals that are used for adoment or for jewelry. To be regarded as a gemstone, a mineral must be beautiful, rare, and durable-hard enough to withstand constant use or handling.There are more than three thousands natural minerals, but less than a hundred are commonly used as gemstones.
Most gemstones are mineral gems, and are found in rocks or in gem gravels. However, a few gems such as amber, Pearl , Coral, and Ivory come from plants or animals. These gems are known as organic gems. Organic gems are not as durable as mineral gems, they are usually polished, carved, or drilled and threaded as beads.