cammeo

Cameo comes from Italian cammeo, a carved relief in gemstone or shell where a raised figure contrasts against a different-colored background layer. The word's deeper origin is disputed — possibly from Arabic qamāʾa (flower bud) or from Latin gemma (gem) through an unknown intermediate.

Cameo carving is ancient — Roman patricians wore cameo portraits, and Augustus Caesar's Great Cameo of France (c. 23 CE) remains one of the largest ever carved. The technique exploits stones with natural color layers: the artist carves away one layer to reveal the contrasting one beneath.

Italian Renaissance craftsmen revived cameo carving, and the word entered English in the 1560s. Queen Elizabeth I was an avid cameo collector. The Victorian era made cameo brooches — usually carved shell portraits in profile — one of the most popular jewelry forms in history.

The modern meaning shift came from theater and film: a 'cameo appearance' (first recorded 1928) meant a brief, vivid role by a notable person — small but sharply defined, like a figure carved in relief. Hitchcock's film cameos cemented the usage.