Sardius
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Strong's Concordance, Hebrew dictionary interprets the Sardius from the Hebrew word אֹדֶם ôdem, (o'-dem), as redness, that is, the ruby, garnet, or some other red gem. Present day dictionary calls it a deep orange-red variety of chalcedony. Then goes on to describe chalcedony as a translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands. Sardius was the first stone in the first row of the Hoshen, the breastplate worn by the Levitical priests, according to the book of Exodus 28:17.
Also a fine internet comedian in his own right.