The topaz; of which see Exodus 28:17, Exodus 39:10. Of Ethiopia, or, of Arabia; for Cush signifies both Ethiopia and Arabia; and the topaz was found in the Red Sea, which lay between both, and so might be ascribed to either.
Related Commentaries of Job 28:19
Job 28:19
19 The topaz of Ethiopia shall not equal it, neither shall it be valued with pure gold.