Antique ring with emerald and brillyantami

[NATA NOVA]

Cabochon (from FF. Caboche - head) - way of handling precious or semiprecious stones, where the stone becomes smooth, convex polished surface without edges, in contrast to the facet-cut, as well as treated in this way stone. Usually polished cabochon has an oval or spherical shape, flat on one side. In a broader sense of the word, is called cabochon polishing of precious and semiprecious stones in contrast to the cut.

In the form cabochon stones are usually processed, having a good color or some optical effect (asterism, irisation), but do not have a strong enough light when cut because of low refractive index or the presence of internal defects. Turbid and translucent varieties are also often polished as cabochons.

However, some stones are showing their dignity is in the form cabochons:

"Stellate Rubin
"Stellate Sapphire"
chrysoberyl (cat's eye ")
oligoclase ("moonstone")
hair-worm
turquoise
opal
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From Wiki