Ring Size Guide

Find Your Perfect Size

Find the size that fits you or a loved one with our Brilliant size guide.
Refer to our measurement charts or follow te instructions below.

Our Size	Inside Circumference (IN)	MM	US & Canada	UK / Ireland	Germany	Japan
49	1.97	50	5.25	K	16	---
50	1.99	50.6	5.5	K-½	16.25	10
51	2.02	51.2	5.75	L	---	11
52	2.04	51.9	6	L-½	16.5	12
52	2.07	52.5	6.25	M	16.75	---
53	2.09	53.1	6.5	M-½	17	13
53	2.12	53.8	6.75	N	---	---
54	2.14	54.4	7	O	17.25	14
55	2.17	55.1	7.25	O-½	17.5	---
55	2.19	55.7	7.5	P	17.75	15
56	2.22	56.3	7.75	P-½	---	---
57	2.24	57	8	Q	18	16
57	2.27	57.6	8.25	Q-½	18.25	---
58	2.29	58.3	8.5	Q-½	18.5	17
59	2.32	58.9	8.75	R	18.75	---
59	2.34	59.5	9	R-½	19	18
59	2.37	60.2	9.25	S	19.25	---
61	2.39	60.8	9.5	S-½	19.5	19
61	2.42	61.4	9.75	T	19.75	---
62	2.44	62.1	10	T-½	20	20

Use a flexible measuring tape or length of string.
Wrap it around the finger you’ll wear your ring on—if you’re creating a ring stack, consider where on your finger the ring will sit. If using string, mark the point on the string where the ends meet with a pen.
Lay the string on a flat surface and use a ruler to measure the length (in inches or millimeters) up to the mark. Compare your measurement to the Brilliant size chart above to determine your ring size. If you are between sizes, opt for the larger size.

A helpful method if you’re surprising someone with a gift or treating yourself.

Choose a ring that already fits your finger well.
Measure the interior diameter of the ring in millimeters (mm).
Use the measurement chart above to match the size of your ring to the closest Brilliant size in millimeters. The interior of the ring should align with the outer edge of the circle.