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Diamond

  1. A precious gem (Hebrew: 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; Revised Version marginal note, “sardonyx.”)

  2. A precious stone (Hebrew: 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.

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