Exodus 28:19-23

and the third row a jacinth, an agate, and an amethyst;

and the fourth row a beryl, and an onyx, and a jasper; they shall be set in gold filigree.

The stones shall be engraved according to the names of the sons of Israel: twelve, according to their names; they shall be like the engravings of a signet, each according to his name for the twelve tribes.

You shall also make on the breastpiece twisted chains of cord work in pure gold.

And you shall make on the breastpiece two rings of gold, and shall put the two rings on the two ends of the breastpiece.