Bible Dictionaries
Sardonyx

American Tract Society Bible Dictionary

As if a sardius united to an onyx; a species of gem exhibiting the reddish color of the carnelian and the white of the chalcedony, intermingled either in shades or in alternate circles, Revelation 21:20 .

Bibliography Information
Rand, W. W. Entry for 'Sardonyx'. American Tract Society Bible Dictionary. https://www.studylight.org/​dictionaries/​eng/​ats/​s/sardonyx.html. 1859.