Which amidst the following is not a gem stone ?

1.	Which amidst the following is not a gem stone ?
Answer» <html><body><p> Cat's-eye</p><br/><br/><p>A gemstone or gem (<a href="https://interviewquestions.tuteehub.com/tag/also-373387" style="font-weight:bold;" target="_blank" title="Click to know more about ALSO">ALSO</a> called a precious or semiprecious 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. However certain rocks (such as lapis lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry, and are <a href="https://interviewquestions.tuteehub.com/tag/therefore-706901" style="font-weight:bold;" target="_blank" title="Click to know more about THEREFORE">THEREFORE</a> often considered to be <a href="https://interviewquestions.tuteehub.com/tag/gemstones-1004246" style="font-weight:bold;" target="_blank" title="Click to know more about GEMSTONES">GEMSTONES</a> as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other physical properties that have aesthetic <a href="https://interviewquestions.tuteehub.com/tag/value-1442530" style="font-weight:bold;" target="_blank" title="Click to know more about VALUE">VALUE</a>. Topaz, Opal and Pearl are gemstones but Cat’s-eye is not a gem stone.</p></body></html>

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