Q.

Which amidst the following is not a gem stone?

A. Cat's-eye
B. Topaz
C. Opal
D. Pearl
Answer» A. 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.
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