Sardine, Sardius
Smith’s Bible Dictionary · William Smith, F. N. Peloubet, M. A. Peloubet
(red) (Heb. odem) the stone which occupied the first place in the first row of the high priests 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 engravers 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.
Source of the article
William Smith; revised by F. N. Peloubet and M. A. Peloubet; CrossWire SWORD module Smith 1.3
Bible Strong digital edition from CrossWire module 1.3, based on the 1884 Peloubet revision with later digital enrichments preserved