| − | A '''gem''' is a [[gemstone]] that has been cut and polished.<ref>http://pubs.usgs.gov/gip/gemstones/terms.html</ref> | + | A '''gem''' is a [[gemstone]] that has been cut and [[polish]]ed.<ref>http://pubs.usgs.gov/gip/gemstones/terms.html</ref> Examples include [[diamond]]s, [[rubies]], and [[emerald]]s. |