King James Version
The sin of Judah is written with a pen of iron, and with the point of a diamond: it is graven upon the table of their heart, and upon the horns of your altars;English Standard Version
"The sin of Judah is written with a pen of iron; with a point of diamond it is engraved on the tablet of their heart, and on the horns of their altars,New International Version
"Judah's sin is engraved with an iron tool, inscribed with a flint point, on the tablets of their hearts and on the horns of their altars.