Sardius. (red). (Hebrew, odem). The stone which occupied the first place in the first row of the high priest's breastplate. Exodus 28:27. The sard, which is probably the stone denoted by odem, is a superior variety of agate, sometimes called camelian, and has long been a favorite stone for the engraver's art. Sardis differ in color: there is a bright-red variety, and, perhaps, the Hebrew, odem, from a root means "to be red," points to this kind.