What Does AU750 Mean on Jewelry?

AU750 means 18-karat gold. 'AU' is the periodic-table symbol for gold (from the Latin aurum) and '750' is the fineness — 75% pure. It's the same standard as a plain 750 or 18K stamp, just written with the element symbol, and is common on imported and designer fine jewelry.

What is a AU750 piece worth?

AU750 is simply 18K gold labeled with gold's chemical symbol; it carries the same 75% gold melt value as any 750 mark.

How to verify a AU750 stamp

Scan the AU750 stamp with the Hallmark Reader to confirm solid 18K. Anyone can stamp a mark on metal, so a hallmark alone isn't proof — the fastest way to check is to photograph the stamp and run it through the free Hallmark Reader, then confirm the metal itself with the Is It Real? tool. For a full picture of what your piece is worth, get a free jewelry appraisal. To compare AU750 with every other mark side by side, see the full jewelry stamps and markings chart.

Frequently asked questions