Assertion: onyx | /r/Synonym | sardonyx
Facets:
Source sentences:
text: In ancient times, people used the red-and-white variety of onyx known as sard or sardonyx to counteract dark onyx.
text: Onyx with white and reddish, brownish, or yellow layers is known as sardonyx, the traditional August birthstone.
text: Onyx with reddish brown and white bands is known as sardonyx.