Noun
a highly polished gem that is cut convexly but without facets
Source: WordNetIn contemporary Western use, turquoise is most often encountered cut en cabochon in silver rings, bracelets, often in the Native American style, or as tumbled or roughly hewn beads in chunky necklaces. Source: Internet
Cymophane has its derivation also from the Greek words meaning 'wave' and 'appearance', in reference to the haziness that visually distorts what would normally be viewed as a well defined surface of a cabochon. Source: Internet
This effect is best seen in gemstones cut in cabochon form perpendicular to the c-axis. Source: Internet