Learning how to read ring mandrel sizes quickly

If you've ever tried to resize a piece of jewelry at home or just wanted to verify your size before buying a new piece online, you've likely realized that knowing how to read ring mandrel markings is the only way to get a truly accurate measurement. It looks like a simple metal or plastic wand with a bunch of lines and numbers on it, but if you don't know which line represents the actual size, you could easily end up with a ring that's a half-size too small or uncomfortably loose. ...

March 1, 2026 · 7 min · Jaffe Paolo