onyx

• Substantivo que designa uma variedade de calcedônia caracterizada por faixas alternadas de preto e branco, frequentemente usada na confecção de camafeus e outras peças de entalhe decorativo.

A noun referring to a type of chalcedony characterized by alternating black and white bands, often used in the creation of cameos and other decorative carvings.

1. A banded gemstoneB2formal

   A type of chalcedony (a variety of quartz) characterized by parallel bands of alternating colors, most commonly black and white, often used in jewelry and cameo carving.

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   • The artisan carved a beautiful cameo from a piece of black and white onyx.
   • She wore a ring set with a polished onyx stone.
   • Onyx is often used in decorative objects due to its striking banded patterns.