Dict: easton - Diamond

easton:

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 kjv@Exodus:28:18 kjv@Exodus:39:11; R.V. marg., "sardonyx.")

(2.) A precious stone (Heb. shamir', a sharp point) mentioned in kjv@Jeremiah:17:1. From its hardness it was used for cutting and perforating other minerals. It is rendered "adamant" (q.v.) in kjv@Ezekiel:3:9, kjv@Zechariah:7:12. It is the hardest and most valuable of precious stones.