Wilson's Dictionary of Bible Types
Revelation 21:20 (b) The beauty and the value of these stones probably represent the beauty and the value of the nation of Israel (the twelve tribes) in GOD's program of world development. Every blessing we enjoy has come to us through the influence of Israel. These influences were of various kinds and characters, and this fact is represented by the various kinds of stones.
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Watson, Walter. Entry for 'Sardonyx'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/s/sardonyx.html. 1957.