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
However certain rocks, (such as lapis lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry
Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other physical properties that have
Thursday , January 29 , 2026
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پنجشنبه ۹ بهمن ۱۴۰۴
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