Description : Which amidst the following is not a gem stone? (1) Cat's-eye (2) Topaz (3) Opal (4) Pearl
Last Answer : (1) Cat's-eye Explanation: A gemstone or gem (also called a precious or semi-precious stone, a fine gem, or jewel) is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments.