Fit

Jewellery sizing guide

Find your Lumière ring size and compare EU ring sizes with US, UK, Japan and inside diameter measurements.

Find the right fit

Measure rings and wrists when your hands are at a normal temperature. EU ring sizes follow inner circumference in millimetres; if you are between sizes, ask our concierge before ordering.

Ring size conversion

Compare Lumière ring sizes

Lumière ring sizes follow the EU circumference format: size 58 means an inside circumference of approximately 58 mm. Most made-to-order ring styles are offered from 58 to 70, with smaller or wider sizes available by concierge advice where the design allows.

Measure

Use a ring that already fits and measure the inside diameter across the widest point.

Compare

Match that diameter or circumference to the EU size, then check the nearest US or UK equivalent.

Confirm

For wide bands, stacking rings, or prominent knuckles, contact us before choosing the final size.

Approximate ring size equivalents. EU size is the inside circumference in millimetres.
Lumière / EU	Inside diameter	US / Canada	UK / Australia	Japan	Availability
44	14.0 mm	3	F	4	Ask concierge
45	14.3 mm	3 1/4	G	5	Ask concierge
46	14.6 mm	3 3/4	H	6	Ask concierge
47	15.0 mm	4	I	7	Ask concierge
48	15.3 mm	4 1/2	I 1/2	8	Ask concierge
49	15.6 mm	5	J 1/2	9	Ask concierge
50	15.9 mm	5 1/4	K	10	Ask concierge
51	16.2 mm	5 3/4	L	11	Ask concierge
52	16.6 mm	6	L 1/2	12	Ask concierge
53	16.9 mm	6 1/2	M 1/2	13	Ask concierge
54	17.2 mm	7	N 1/2	14	Ask concierge
55	17.5 mm	7 1/4	O	15	Ask concierge
56	17.8 mm	7 1/2	P	16	Ask concierge
57	18.1 mm	8	P 1/2	17	Ask concierge
58	18.5 mm	8 1/4	Q 1/2	18	Core Lumière range
59	18.8 mm	8 3/4	R	19	Core Lumière range
60	19.1 mm	9	S	20	Core Lumière range
61	19.4 mm	9 1/2	S 1/2	21	Core Lumière range
62	19.7 mm	10	T 1/2	22	Core Lumière range
63	20.1 mm	10 1/4	U 1/2	23	Core Lumière range
64	20.4 mm	10 3/4	V	24	Core Lumière range
65	20.7 mm	11	W	25	Core Lumière range
66	21.0 mm	11 1/2	W 1/2	26	Core Lumière range
67	21.3 mm	12	X 1/2	27	Core Lumière range
68	21.6 mm	12 1/4	Z	28	Core Lumière range
69	22.0 mm	12 3/4	Z+1	29	Core Lumière range
70	22.3 mm	13	Z+2	30	Core Lumière range
71	22.6 mm	13 1/2	Z+3	31	Ask concierge
72	22.9 mm	14	Z+4	32	Ask concierge
73	23.2 mm	14 1/4	Z+5	33	Ask concierge
74	23.6 mm	14 3/4	Z+6	34	Ask concierge
75	23.9 mm	15	Z+7	35	Ask concierge
76	24.2 mm	15 1/2	Z+8	36	Ask concierge

Conversion charts are approximate because international systems round at different points. When measurements fall between sizes, choose the circumference measurement first and ask our concierge for fit guidance.