cabochon
Noun
Meaning
a highly polished gem that is cut convexly but without facets
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Examples
In 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.
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.
This effect is best seen in gemstones cut in cabochon form perpendicular to the c-axis.