Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
Frequently referred to (1 Ki. 10:2; 2 Chr. 3:6, 9:10; Rev. 18:16, 21:19). There are about twenty different names of such stones in the Bible. They are figuratively introduced to denote value, beauty, durability (Song 5:14; Isa. 54:11, 12; Lam. 4:7).