CABACHON: A stone without facets, and shaped like a dome.
CAMEO: Conch shell, onyx gem, coral and various gemstones, which were carved in either relief or intaglio. Cameos are also molded in synthetics such as plastic or glass.
Cabachon
A cabochon is a stone that has a rounded, domed surface with no facets.
Emerald
A rectangular cut often used for emeralds (hence the name) but also for diamonds and other stones.
Cabachon cut
The rounding of a gem without facets into the shape of a highly polished dome.
Cameo ...
Cabachon - Different Mm Highly polished with a convex (outwardly rounded) surface, gemstone cabochons have been mounted into jewelry settings for millennia.
Cabochon or Cabachon
From the French word caboche is a semi precious or precious stone that has been cut, shaped and polished as opposed to faceted. It is usually elliptical in shape with a flat back and an oval top.
A short term for cabachons
Carnelian
A semiprecious stone that varies from translucent to opaque and has color from yellow to reddish brown.
The beautiful Art pin above has delicate enamel work, blue and green cabachon plastic moonstones, tiny, clear rhinestones, a dangle, and a Florentine finish.
Some notable genuine rubies include: The Chhatrapati Manick, a forty carat cabachon, the 167 carat Edwardes ruby in the British Natural History Museum and the 100 carat De Long star ruby in the American Museum of Natural History.
Lapidary: This person may cut cabachon, facetted stones or carve gem materials. It can range from recutting jobs to unique sculptures in carved gems.
The egg is surmounted by an Imperial crown of rose diamonds and cabachon rubies. A pearl knob, when twisted, reveals the surprise of this egg: portrait miniatures of Czar Nicholas II and his two oldest daughters: Olga and Tatiana.
Their medium- to high-quality pieces included figurals, Victorian replicas, and many different styles. The beautiful Art pin above has delicate enamel work, blue and green cabachon plastic moonstones, tiny, clear rhinestones, a dangle, ...
This material is commonly faceted rather than cabachoned.
Common Opal ("Potch") - translucent to opaque, having nearly any body color, but no play-of-color. Known by a myriad of names; e.g. Matrix Opal, "Geyserite", "Wood Opal", etc..
 See also: Cut, Facet, Color, Faceted, Jewel
  
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