Exodus 39:14-16

14There were twelve stones according to the names of the sons of Israel: according to their names, engraved like a signet, each one with its own name according to the twelve tribes.

15And they made chains for the breastplate at the ends, like braided cords of pure gold.

16They also made two settings of gold and two gold rings, and put the two rings on the two ends of the breastplate.