Oct 26, 2012· Gemstones 1 Shaumik Daityari GLT, 2nd year 2 GemstoneA gemstone or gem (also called a precious or semi-precious stone, a fine gem, or jewel) is a piece ofmineral, which, in cut and polished form, is used tomake jewellery or other adornmentsCertain other materials (like amber) which are notminerals, used to make jewellery, are also calledgemston