AURELIAN Size Guide

AURELIAN confirms sizing before every custom piece enters production.

Every size. Every diamond shape. Made for you.

AURELIAN creates rings in all sizes and across every diamond shape, setting style, band width and proportion. If your size or preferred configuration is not listed, our Private Client team can arrange extended sizing and bespoke customisation. Contact AURELIAN to discuss your requirements.

AURELIAN international ring-size comparison

The first three columns exactly match our product options. Metric and international values are references.

HK US Product UK/AU Ø mm Circ. mm EU Japan/Asia Swiss UK/AU refs
11 5 J½ 15.7 49.3 49 9 9.25 J–J½
12 5.5 K½ 16.1 50.6 51 10 10.5 K–L
13 6 L½ 16.5 51.9 52 11–12 11.75 L–M
14 6.25 M 16.7 52.5 53 12–13 12.5 L½–M
15 6.75 N 17.1 53.8 54 14 13.75 M½–N
16 7 N½ 17.3 54.4 54 14 14.5 N–O
17 7.5 O½ 17.7 55.7 56 15 15.75 O–P
18 8 P½ 18.1 57.0 57 16 17 P–Q
19 8.5 Q½ 18.5 58.3 58 17 18.25 Q–Q½
20 9.25 R 19.2 60.3 60 19 20.25 R½–S
21 9.5 S 19.4 60.8 61 19 20.75 S–S½

Extended international sizes

Reference conversions continue beyond AURELIAN’s current product options to the largest size supplied: 24.64 mm (US 16). A dash means that the supplied chart does not publish an equivalent.

Ø mm Circ./EU mm US UK/AU Japan Swiss
19.5 61.4 9¾ T 20 21.5
19.76 62.1 10 T½ 21 22
20.0 62.7 10¼ U 22 22.75
20.17 63.4 10½ U½ — 23.25
20.37 64.0 10¾ V 23 24
20.5 64.6 11 V½ — 24.75
20.78 65.3 11¼ W 24 25.25
21.0 65.9 11½ W½ — 26
21.18 66.6 11¾ X 25 26.5
21.39 67.2 12 X½ — 27.25
21.5 67.8 12¼ Y 26 27.75
21.79 68.5 12½ Z — 28.5
22.0 69.1 12¾ Z½ 27 29
22.2 69.7 13 — — 29.75
22.5 70.4 13¼ Z1 — 30.5
22.61 71.0 13½ — — 31
22.81 71.7 13¾ Z2 — 31.75
23.0 72.3 14 Z3 — 32.25
23.22 72.9 14¼ — — 33
23.5 73.6 14½ Z4 — 33.5
23.62 74.2 14¾ — — 34.25
23.83 74.8 15 — — 34.75
24.0 75.5 15¼ — — 35.5
24.23 76.1 15½ — — 36.25
24.5 76.8 15¾ — — 36.75
24.64 77.4 16 — — 37.5

½ denotes a half size. Published charts vary by brand and standard; the final column shows their conversion range. AURELIAN product labels remain the governing selection.

HK 20 and HK 21: our products use R and S. Reference charts place the same US sizes across R½–S and S–S½, so we confirm the millimetre measurement before production.

How to measure

Measure the inside diameter of a well-fitting ring across its widest inner point, excluding the metal. Measure in millimetres late in the day. Wide bands, eternity rings and prominent knuckles may need a larger size.

FAQ · Diamond Guide · Sizing assistance