Exodus 28:9-12

9Take two onyx stones and engrave on them the names of the sons of Israel: 10six of their names on one stone and the remaining six on the other, in the order of their birth. 11Engrave the names of the sons of Israel on the two stones the way a gem cutter engraves a seal. Then mount the stones in gold filigree settings. 12Fasten both stones on the shoulder pieces of the ephod as memorial stones for the sons of Israel. Aaron is to bear their names on his two shoulders as a memorial before the LORD.