a crystalline rock that can be cut and polished for jewelry

any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive

a transparent purple variety of quartz; used as a gemstone

a transparent variety of beryl that is blue green in color

a milky or greyish translucent to transparent quartz

a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone