odem, i.e. "the red stone" (with a yellow shade). Exo_28:17; Exo_39:10; Eze_28:13. Much used by the ancients for seals, as being tough yet easily worked, beautiful, and susceptible of high polish; the best stone for engraving. Josephus (the best authority, being a priest, therefore having often seen the high priest's breast-plate) calls it the sardonyx, the first stone in the high priest's breast-plate, in Ant. 3:7, section 5, but the sard or sardine, B.J. 5:5, section 7. Both sardine and sardonyx are varieties of agate. He on the heavenly throne "was to look upon like a jasper and a sardine" (Rev_4:3). As the jasper (or else diamond) represents the divine brightness or holiness, so the red sardine (our cornelian) His fiery wrath; the same union as in Eze_1:4; Eze_8:2; Dan_7:9. Named from Sardis in Lydia, where it was first found. The Hebrew got their high priest's sardines in Arabia, and from Egypt (Exo_12:35).
Fausset's Bible Dictionary
By Andrew Robert Fausset, co-Author of Jamieson, Fausset and Brown's 1888.
Sardine. See Sardius.
Smith's Bible Dictionary
By Dr. William Smith.Published in 1863
Sardine
(σάρδινος, apparently an adjective from σάρδιον, which has the same signification), the name of a gem (Rev_4:3). SEE SARDIUS.
CYCLOPEDIA OF BIBLICAL, THEOLOGICAL AND ECCLESIASTICAL
press 1895.