Diamond. One of the gems in the high priest's breastplate is so called in our version. Exodus 28:18; Exodus 39:11. The same word also occurs in reference to the king of Tyre. Ezekiel 28:13. It was doubtless some hard stone; for the original Hebrew term implies striking. But it is questionable whether, in the early ages of the world, the art or cutting and engraving the diamond was understood. It is, therefore, more generally supposed that an onyx or some other hard crystal is here meant.