adamant (stone), brier, diamond
Boyd’s Bible Dictionary:
(adamant). Pure crystallized carbon. Third stone in second row of high-priest’s breastplate (Ex. 28:18; Ezek. 28:13).
“Briers” From Concise Bible Dictionary:
Six different Hebrew words are so translated, several of which cannot be particularized. It shows how abundant are the fruits of the curse pronounced in Eden because of the sin of man, but which will be removed in the millennium, when the myrtle, etc., will take its place (Judg. 8:7, 16; Isa. 5:6; Isa. 55:13; Ezek. 2:6; Ezek. 28:24; Mic. 7:4).
“Diamond” From Concise Bible Dictionary:
The Hebrew word in Exodus 28:18; Exodus 39:11 and Ezekiel 28:13, is yahalom. It occurs only in these places, and cannot be identified: it is generally held not to be what is now known as the diamond. In Jeremiah 17:1 The word is shamir. This is translated “adamant” in Ezekiel 3:9. It is thought to be the corundum, a very hard stone, but being of different hues it has now various names.
Corundum (Var. Sapphire)
Diamond
Strong’s Dictionary of Hebrew Words:
Meaning:
from 8104 in the original sense of pricking; a thorn; also (from its keenness for scratching) a gem, probably the diamond
KJV Usage:
adamant (stone), brier, diamond