ring-size-chart
INSTRUCTIONS TO FIND YOUR RING SIZE
1. Find the inner diameter - Take a ring that fits on the finger you are buying for and measure the inner diameter. Every millimeter counts, so be strict. If you don't have a ring use a piece of string around your finger to find your inner circumference. Do this step more than once to check you keep getting the same result.
2. Check the chart below - Now that you know your inner diameter or circumference, use the chart below to find your size. If you fall in between sizes, go up a size, e.g. You are a 7 1/2, then you can buy a size 8. It's better your ring is a little looser than tighter.