sardonyx
noun
sar·don·yx sär-ˈdä-niks 
also ˈsär-də-niks
: an onyx having parallel layers of sard
Example Sentences
Recent Examples on the Web It is mounted in yellow gold and carved in pink-colored sardonyx, the figure of a cupid seated on a rock, his ankle in chains, his arms and hands raised to his face, wiping away tears. 
Beth Bernstein, Forbes, 8 June 2022 Yet the sardonyx into which all this was carved is about a half-inch thick. Judith H. Dobrzynski, WSJ, 21 Sep. 2018
Beth Bernstein, Forbes, 8 June 2022 Yet the sardonyx into which all this was carved is about a half-inch thick. Judith H. Dobrzynski, WSJ, 21 Sep. 2018 Word History
Etymology
Middle English sardonix, from Latin sardonyx, from Greek
First Known Use
14th century, in the meaning defined above