Customer care
Ring Size Guide
Australian (A–Z) sizing with millimetre diameter, circumference, and US / Canada equivalents. Two simple methods to measure at home — or visit our Reservoir showroom for a free professional sizing.
Australian ring size chart
| Diameter (mm) | Circumference (mm) | Australia & NZ | USA & Canada |
|---|---|---|---|
| 14.1 | 44.2 | F | 3 |
| 14.5 | 45.5 | G | 3 1/2 |
| 14.9 | 46.7 | H | 4 |
| 15.3 | 48.0 | I | 4 1/2 |
| 15.5 | 48.7 | J | 4 3/4 |
| 15.9 | 49.9 | K | 5 1/4 |
| 16.3 | 51.2 | L | 5 3/4 |
| 16.7 | 52.5 | M | 6 1/4 |
| 17.1 | 53.8 | N | 6 3/4 |
| 17.5 | 55.0 | O | 7 1/4 |
| 17.9 | 56.3 | P | 7 3/4 |
| 18.3 | 57.6 | Q | 8 1/4 |
| 18.7 | 58.9 | R | 8 3/4 |
| 19.2 | 60.1 | S | 9 1/4 |
| 19.6 | 61.4 | T | 9 3/4 |
| 20.0 | 62.7 | U | 10 1/4 |
| 20.4 | 64.0 | V | 10 3/4 |
| 20.8 | 65.2 | W | 11 1/4 |
| 21.2 | 66.5 | X | 11 3/4 |
| 21.6 | 67.8 | Y | 12 1/4 |
| 21.8 | 68.4 | Z | 12 1/2 |
| 22.4 | 70.3 | Z1 | 13 1/4 |
| 22.8 | 71.6 | Z2 | 13 3/4 |
| 23.0 | 72.3 | Z3 | 14 |
| 23.4 | 73.5 | Z4 | 14 1/2 |
Tip: hover or scroll horizontally on mobile — the chart is sortable left-to-right by diameter.
Find my ring size
Choose whichever method is easier — both lead to the same answer. Take two readings and go with the one in the middle if they disagree.
Using a ring you already own
Measure diameter
- Pick a ring that fits comfortably on the finger you want to size.
- Measure the inside diameter of the ring in millimetres.
- Match the number to the Diameter (mm) column above.
Using your finger
Measure circumference
- Cut a piece of string about 10 cm long.
- Wrap it around your finger where the ring will sit — snug, not tight.
- Mark where the ends meet.
- Lay the string flat and measure between the two marks in millimetres.
- Match the number to the Circumference (mm) column above.
No string? A strip of paper works just as well.
Expert tips for a perfect fit
- Measure the correct finger — the same finger on the opposite hand can differ by half a size.
- Always measure twice, and a third time if the readings disagree.
- Measure in the afternoon, when your hands are warm — that’s when fingers are at their average size.
- Oversized or chunky rings may need an extra half-size up to slide over the knuckle comfortably.
- If you’re between two sizes, round up — rings are easier to resize down than to stretch up.
- Still unsure? Contact Customer Service — we’ll post you a complimentary plastic ring sizer.
In-store service
Professional Ring Sizing
Find the perfect fit for your ring with expert sizing assistance. Whether you’re choosing an engagement ring or a special piece, our team will ensure it feels just right — using calibrated steel sizers at the bench.
Bangles — inner diameter
2-2
55 mm
Petite wrist · XS
2-4
58 mm
Small · S
2-6
62 mm
Medium · M
2-8
65 mm
Large · L
2-10
68 mm
Extra Large · XL
Bangles are measured by inside diameter (mm). Wrap a string around the widest part of your hand (where it folds inward at the thumb) for the closest equivalent.
Chain & necklace lengths
- 14" / 36 cmCollar (sits snug at the base of the neck)
- 16" / 41 cmChoker (rests on the collarbone)
- 18" / 46 cmPrincess (most popular — just below the collarbone)
- 20" / 51 cmMatinee (sits on the chest)
- 24" / 61 cmOpera (longer layering length)
Free complimentary resizing within 30 days of purchase on most rings — conditions apply. Pop into 261–263 Broadway, Reservoir VIC any time for an in-person sizing on the house.