sardonyx

• Variété d'onyx, pierre fine composée de couches parallèles alternées de sardoline ou de cornaline (calcédoine rougeâtre) et d'une autre calcédoine, généralement blanche ou noire.

A gemstone variety of onyx featuring alternating parallel bands of sard (a reddish-brown chalcedony) and another mineral, typically white or black chalcedony.

1. A type of gemstoneC1formal

   A gemstone variety of onyx that features alternating parallel bands of sard (a reddish-brown chalcedony) and another mineral, often white or black.

   Sardonyx (variété de calcédoine)

   • The ancient ring was set with a beautifully carved sardonyx.
   • Sardonyx is often used in cameos due to its layered structure.
   • Collectors prize sardonyx for its distinctive striped appearance.