Sizing

Ring Size Guide

Finding your perfect fit is easier with the right method. Use any of the options below, or contact us before ordering if you are unsure.

How to Measure

Use a Ring You Own

Place a ring you already wear onto a ruler. Measure the inside diameter in millimetres and match to the chart below.

Wrap a Strip of Paper

Cut a thin strip of paper and wrap it snugly around your finger. Mark where it overlaps and measure the length in millimetres. This is your circumference.

Contact Us Before Ordering

If you are unsure about your size, email contact@lunediamond.com before placing your order. We can guide you through the best measuring method for your chosen design.

Ring Size Chart

AU / US Size	Circumference (mm)	Diameter (mm)	Diameter (in)
H / 4	46.8 mm	14.9 mm	0.59 in
I / 4.5	48.0 mm	15.3 mm	0.60 in
J / 5	49.3 mm	15.7 mm	0.62 in
K / 5.5	50.6 mm	16.1 mm	0.63 in
L / 6	51.9 mm	16.5 mm	0.65 in
M / 6.5	53.1 mm	16.9 mm	0.66 in
N / 7	54.4 mm	17.3 mm	0.68 in
O / 7.5	55.7 mm	17.7 mm	0.70 in
P / 8	57.0 mm	18.1 mm	0.71 in
Q / 8.5	58.3 mm	18.5 mm	0.73 in
R / 9	59.5 mm	18.9 mm	0.74 in
S / 9.5	60.8 mm	19.4 mm	0.76 in
T / 10	62.1 mm	19.8 mm	0.78 in