Sizing Guide

Get the size right

Every ring is cast to order in the size you choose — so a good fit starts here. Three ways to find your size, most accurate first.

And if it still ends up wrong, it's not the end of the world. We offer exchanges and repours — but each recast takes time on the bench, so a few minutes measuring now saves you weeks of waiting later.

Method 01 — most accurate

Measure a ring you already own

The surest way. No calibration, no guesswork — just a ruler and a ring that fits the same finger.

  1. Take a ring that fits the finger you're buying for.
  2. Lay it on a flat surface. Measure straight across the inside of the band, edge to edge, at the widest point — in millimetres.
  3. Find that number in the inside diameter column below.
Measure the hole, not the metal. If you have digital calipers, even better. If your number lands between two sizes, go up — especially for the wider bands.
Method 02 — no ring needed

Paper strip

Works if you don't own a ring for that finger. Slightly less precise — do it twice and compare.

  1. Cut a strip of paper about 5mm wide.
  2. Wrap it around the base of the finger — snug, not tight. It needs to clear the knuckle, so check it slides over.
  3. Mark where the paper overlaps. Unroll it and measure to the mark in millimetres.
  4. Find that number in the circumference column below.
Fingers change size through the day — measure in the evening, at room temperature, when they're at their largest. Cold hands measure small.

Size chart

Australian sizing. Every letter is 0.4mm of diameter apart.

Size Inside diameter Circumference
J 15.6mm 49mm
K 16.0mm 50mm
L 16.4mm 52mm
M 16.8mm 53mm
N 17.2mm 54mm
O 17.6mm 55mm
P 18.0mm 57mm
Q 18.4mm 58mm
R 18.8mm 59mm
S 19.2mm 60mm
T 19.6mm 62mm
U 20.0mm 63mm
V 20.4mm 64mm
W 20.8mm 65mm
X 21.2mm 67mm
Y 21.6mm 68mm
Z 22.0mm 69mm
Wide or heavy bands wear tighter than slim ones. Borderline between two sizes — take the larger. Need something outside this range? Email us and we'll cast it.
Your screen is zoomed — sizing will be wrong. Reset zoom to 100%, then recalibrate.
Method 03 — backup

On-screen sizer

Match a ring you own against calibrated circles on your screen. It works — but it depends on careful calibration, so treat it as a cross-check against method 01 rather than a replacement.

How to calibrate:
1. Hold a $2 coin flat against your screen.
2. Move the slider until the grey disc — including the black rim — sits exactly behind your coin.
3. Lay a ring that already fits you over the circles below. Line the inside of your band up with the inside edge of the black line. Screen flat, eye directly above — looking at an angle will throw it off.

01 / Calibrate

02 / Match inside diameter

Match the inside of your band to the inside edge of the black line.

Wide or heavy bands wear tighter. If you land between sizes, go up.
Still not sure? Email hello@cultureofthesun.com.au before you order. And if the size does come back wrong, we'll sort an exchange or repour — it just means going back on the wait list while it's recast.