וְלָ֣קַחְתָּ֔ אֶת־שְׁתֵּ֖י אַבְנֵי־שֹׁ֑הַם וּפִתַּחְתָּ֣ עֲלֵיהֶ֔ם שְׁמ֖וֹת בְּנֵ֥י יִשְׂרָאֵֽל׃
And thou shalt take two onyx stones, and grave on them the names of the children of Israel:
Read halakhic rulings (Jewish law) on Exodus 28:9: and classical halakhic sources.