TSK · Job 19:24

With the work of an engraver in stone, like the engravings of a signet, you shall engrave the two stones, according to the names of the children of Israel: you shall make them to be enclosed in settings of gold.

The tablets were the work of God, and the writing was the writing of God, engraved on the tables.

You shall write on the stones all the words of this law very plainly."