Exodus 28:9-11 NIV

9 "Take two onyx stones and engrave1 on them the names of the sons of Israel

References for Exodus 28:9

10 in the order of their birth--six names on one stone and the remaining six on the other.
11 Engrave 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