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  A gemstone is a mineral, rock (such in the case of lapis lazuli), or petrified material that when cut or faceted and polished is collectible or can be used in jewelry. Others are organic (such as amber, which is fossilised tree resin, and jet, a form of coal). A valuable (colored) gemstone is prized especially for its great beauty, rarity ,size , Color , aesthetics , market supply, popularity of a stone, market mechanisms etc. Traditionally, common gemstones were classified into precious stones (cardinal gems) and semi-precious stones. There are more than 200 gemstones under Semi-precious Stones Category . The loose Semi-precious stones which are made available at ketaki’s are given below :
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