Jewellery Size Guide

Robert Bell Goldsmith

Jewellery Size Guide

Use this general guide to compare international ring sizes and measure other jewellery. Always check individual product information where a design has its own measurements.

Ring sizes

South African and UK ring sizes use the same letter system. US conversions are approximate.

South Africa / UK	Inside diameter	Inside circumference	US / Canada
A	11.94 mm	37.50 mm	0.5
A½	12.14 mm	38.13 mm	0.75
B	12.33 mm	38.75 mm	1
B½	12.53 mm	39.38 mm	1.25
C	12.73 mm	40.00 mm	1.5
C½	12.93 mm	40.63 mm	1.75
D	13.13 mm	41.25 mm	2
D½	13.33 mm	41.88 mm	2.25
E	13.53 mm	42.50 mm	2.5
E½	13.73 mm	43.13 mm	2.75
F	13.93 mm	43.75 mm	3
F½	14.13 mm	44.38 mm	3.25
G	14.32 mm	45.00 mm	3.5
G½	14.52 mm	45.63 mm	3.75
H	14.72 mm	46.25 mm	4
H½	14.92 mm	46.88 mm	4.25
I	15.12 mm	47.50 mm	4.5
I½	15.32 mm	48.13 mm	4.75
J	15.52 mm	48.75 mm	5
J½	15.72 mm	49.38 mm	5.25
K	15.92 mm	50.00 mm	5.5
K½	16.11 mm	50.63 mm	5.75
L	16.31 mm	51.25 mm	6
L½	16.51 mm	51.88 mm	6.25
M	16.71 mm	52.50 mm	6.5
M½	16.91 mm	53.13 mm	6.75
N	17.11 mm	53.75 mm	7
N½	17.31 mm	54.38 mm	7.25
O	17.51 mm	55.00 mm	7.5
O½	17.71 mm	55.63 mm	7.75
P	17.90 mm	56.25 mm	8
P½	18.10 mm	56.88 mm	8.25
Q	18.30 mm	57.50 mm	8.5
Q½	18.50 mm	58.13 mm	8.75
R	18.70 mm	58.75 mm	9
R½	18.90 mm	59.38 mm	9.25
S	19.10 mm	60.00 mm	9.5
S½	19.30 mm	60.63 mm	9.75
T	19.50 mm	61.25 mm	10
T½	19.70 mm	61.88 mm	10.25
U	19.89 mm	62.50 mm	10.5
U½	20.09 mm	63.13 mm	10.75
V	20.29 mm	63.75 mm	11
V½	20.49 mm	64.38 mm	11.25
W	20.69 mm	65.00 mm	11.5
W½	20.89 mm	65.63 mm	11.75
X	21.09 mm	66.25 mm	12
X½	21.29 mm	66.88 mm	12.25
Y	21.49 mm	67.50 mm	12.5
Y½	21.68 mm	68.13 mm	12.75
Z	21.88 mm	68.75 mm	13
Z½	22.08 mm	69.38 mm	13.25
Z+1	22.48 mm	70.63 mm	13.75
Z+2	22.88 mm	71.88 mm	14.25
Z+3	23.28 mm	73.13 mm	14.75
Z+4	23.67 mm	74.38 mm	15.25
Z+5	24.07 mm	75.63 mm	15.75
Z+6	24.47 mm	76.88 mm	16.25
Z+7	24.87 mm	78.13 mm	16.75

Rings are normally confirmed after checkout before processing. Resizing depends on the design and material and may incur an additional cost or delay.

Bangle sizes

Bangle sizing varies by shape and whether the piece is open or closed. Measure your hand or wrist according to the design, then compare it with the table below.

Size	Measurement	Fit guidance
XL	70 mm inner diameter	Extra-large fit
L	65 mm inner diameter	Larger fit
M	60 mm inner diameter	Average fit
S	55 mm inner diameter	Small to average fit
XS	50 mm inner diameter	Small fit

These are general sizing ranges, not measurements for a specific product.

Bracelet sizes

Measure around your wrist and add the amount of ease shown below. A closer fit suits fitted bracelets; more room gives a looser drape.

Size	Measurement	Fit guidance
XL	20-25 cm wrist	Roomier fit
L	17-20 cm wrist	Relaxed fit
M	16-17 cm wrist	Regular fit
S	15-16 cm wrist	Close to regular fit
XS	14-15 cm wrist	Close fit

If a product has its own listed length, use that measurement as the final reference.

Anklet sizes

Measure around your ankle where you want the anklet to sit, then allow extra room for comfort.

Size	Measurement	Fit guidance
XL	25-26 cm ankle	Roomier fit
L	24-25 cm ankle	Relaxed fit
M	23-24 cm ankle	Regular fit
S	22-23 cm ankle	Close to regular fit
XS	21-22 cm ankle	Close fit

Choose a shorter fit for a closer look and additional length for a looser fit.

Necklace lengths

Necklace length affects where the chain sits. Measure a necklace you already like or use the general guide below.

Size	Measurement	Fit guidance
Choker	35-40 cm	Close around the neck
Princess	45 cm	Around the collarbone
Matinee	50-60 cm	Upper to mid chest
Opera	70-90 cm	Lower chest
Rope	100 cm or longer	Long or layered styling

Pendant size, chain thickness and the wearer's proportions can change the final appearance.

Earrings

Earrings do not usually require a standard size choice. Their dimensions and drop length are the most useful measurements.

Size	Measurement	Fit guidance
Studs	Small to medium	No standard size selection is usually needed
Drops	Varies by drop length	Check the listed length
Hoops	Varies by diameter	Check the listed diameter
Clusters	Varies by design	Check the listed dimensions