A stone of convex form, highly polished, but not faceted; also, the style of cutting itself. Such stones are said to be cut en cabochon. [Webster 1913 Suppl.]

cabochon, a. [see cabochon, n..].

Of, pertaining to, containing, or in the style of, a cabochon. [PJC]

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OXFORD DICTIONARY

cabochon, n. a gem polished but not faceted.

Idiom

en cabochon (of a gem) treated in this way.

Etymology

F dimin. of caboche: see CABBAGE

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