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Blackstone Jewellery

Ring Size Guide

Method 1 — Measure an Existing Ring

Measure the inner diameter of a ring that fits the intended finger well, in millimetres, and match it to the closest size in the table below.

Method 2 — Measure Your Finger

Wrap a strip of paper or string around the base of your finger, mark where it overlaps, and measure the length in millimetres. Divide by 3.14 to get your diameter, then match it below.

India SizeUS SizeInner Diameter
8414.9mm
10515.7mm
12616.5mm
14717.3mm
16818.1mm
18919.0mm

Between sizes? We recommend sizing up for a more comfortable fit.