sardonyx

noun1

1. •
   A gemstone having bands of red sard; a variety of onyx or chalcedony.

   • The fifth, sardonyx; the sixth, sardius; the seventh, chrysolyte; the eighth, beryl; the ninth, a topaz; the tenth, a chrysoprasus; the eleventh, a jacinth; the twelfth, an amethyst. — 1611