DICT.TW Dictionary Taiwan

 cam·eo /ˈkæmiˌo/
 刻有浮雕的寶石或貝殼

 Cam·e·o n.; pl. Cameos   A carving in relief, esp. one on a small scale used as a jewel for personal adornment, or like.
 Note: ☞ Most cameos are carved in a material which has layers of different colors, such stones as the onyx and sardonyx, and various kinds of shells, being used.  The classical cameos made in Italy are carved on a seashell (see cameo conch, below), having an olive figure carved from the inner layer of the shell in relief on the white background of the outer layer of the shell.
 Cameo conch Zool., a large, marine, univalve shell, esp. Cassis cameo, Cassis rua, and allied species, used for cutting cameos. See Quern conch.
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 cameo
      n : engraving or carving in low relief on a stone (as in a
          brooch or ring)