Exodus 28:11
11 As a jeweler engraves signets, so shall you engrave the two stones with the names of the sons of Israel. You shall enclose them in settings of gold filigree.
Exodus 28:21
21 There shall be twelve stones with their names according to the names of the sons of Israel. They shall be like signets, each engraved with its name, for the twelve tribes.
Exodus 28:36
36 “You shall make ra plate of pure gold and engrave on it, like the engraving of a signet, s‘Holy to the Lord.’