Sardius

Sardius takes its name from Sardis, the wealthy capital of ancient Lydia in Asia Minor, a city ancient sources associate with an early and substantial supply of the deep red-orange stone reaching Mediterranean markets. The naming pattern, a gem called after the trading city most associated with it rather than after its actual place of geological origin, recurs elsewhere in ancient mineral names and reflects how such stones typically reached buyers: through a market's reputation rather than through direct knowledge of where in the earth the stone was actually found.

As the first stone named in Exodus 28's list of twelve, assigned to Reuben, Jacob's firstborn son, sardius holds the opening position in the breastplate sequence, a placement several commentators have read, like jasper's closing one, as meaningfully paired with the birth order of the tribe it represents.

The Hebrew name works on a different principle from the Greek one. The word is odem, built on the root meaning red, the same root behind adom for the colour and behind the names Adam and adamah, the ground. Where the Greek and Latin traditions named the stone after the market it came through, the Hebrew names it after the one property a viewer cannot mistake, which makes odem one of the more secure readings in the breastplate list even where the exact mineral remains open.

That security is relative rather than absolute. Naming a stone by its colour narrows the field to the red chalcedonies and rules out very little within it, so the Hebrew tells us the stone was red without telling us which red stone it was.

Modern gemology generally identifies sardius with sard, a deep brownish-red variety of chalcedony, itself closely related to and sometimes not sharply distinguished from carnelian, the more orange-red variety that appears as its own separate entry in this atlas. The distinction between sard and carnelian is a matter of shade and depth of color rather than a difference in mineral structure, and ancient writers did not always draw the line where modern gemologists now do, which is part of why "sardius," "sard" and "carnelian" overlap so heavily in older translations and commentaries.

The King James Bible's choice of "sardius" for the Hebrew odem preserves an older English name for what would, in a modern gem catalogue, most likely simply be called carnelian or sard, making the distinction between this entry and this atlas's separate Carnelian entry primarily one of historical, biblical naming rather than of the stone itself.

Whatever it is called, the stone has one of the longest continuous records of use of any material in this atlas. Carnelian beads were traded out of the Indus valley into Mesopotamia in the third millennium BC, including the distinctive etched beads produced by treating the surface with an alkaline paste before heating, examples of which were excavated from the royal graves at Ur.

Egyptian use is comparably early and better documented in a religious setting: carnelian appears constantly in amulets and inlay, and the red of the stone was one of the working colours of Egyptian funerary craft rather than an occasional choice. A material that available, and that widely worked, was always going to end up in a priestly vestment somewhere.