Diamond

"(1.) A precious gem (Heb. yahalom', in allusion to its" "hardness), otherwise unknown, the sixth, i.e., the third in the" "second row, in the breastplate of the high priest, with the name" "of Naphtali engraven on it (Ex. 28:18; 39:11; R.V. marg.," sardonyx.) "(2.) A precious stone (Heb. shamir', a sharp point) mentioned in Jer. 17:1. From its hardness it was used for cutting and "perforating other minerals. It is rendered "adamant" (q.v.) in" "Ezek. 3:9, Zech. 7:12. It is the hardest and most valuable of" precious stones.