The World of Jewellery

Practical guides to choosing jewellery, materials and care — so you know what you are buying and how to wear it.

Start here

Gift ideasSummer jewellery: light pieces for holidays, heat and the beachLight, secure and kind to warm skin: how to choose jewellery for hot days, holidays and the beach, and how to keep the plating looking good all summer.
Style and inspirationROTAS69: more than jewelleryWhat ROTAS69 is, why we chose medical steel and gold plating, and what that means for you as a customer.
Materials and qualityCubic zirconia: what it is and how it differs from diamondCubic zirconia in jewellery: what kind of stone it is, how it differs from diamond and how to care for it. Jewellery with cubic zirconia from ROTAS69.
ZodiacGemini jewellery — what suits the signWhich jewellery suits a Gemini: the shapes, metals and colours to choose, and what to give as a gift. For sizing and care, see our guides.
ZodiacTaurus jewellery — what suits the signWhich jewellery suits a Taurus: the shapes, metals and colours to choose, and what to give. For sizing and care, see our guides.
ZodiacAries jewellery — what suits the signWhich jewellery suits an Aries: the shapes, metals and colours to choose, and what to give. For sizing and care, see our guides.
Gift ideasAnniversary gift for your partner: jewellery ideas for her and for himAnniversary jewellery ideas for her and for him, from pendants and pearls to men's chains and rings, plus how to get the size and colour right without giving the game away.
Gift ideasBirthday gift for your sister: jewellery with meaningHow to choose a birthday present for your sister that says something – her initial, her star sign, a lucky charm or a matching piece for the two of you – and how to get the size and colour right.
Gift ideasGifts for Mum – jewellery she'll genuinely loveWhat to give your mum – jewellery she'll actually wear, and how to choose it by her style rather than by the price tag.
Materials and qualityHow to care for gold-plated jewellery so the plating lastsHow to look after medical gold jewellery: why you mustn't polish it, what never to use, and where wear shows up first.
Materials and qualityMedical gold – what it is and how to care for itWhat medical gold is, how it differs from solid gold and why it doesn't cause allergies – plus its benefits, care tips and pieces with 18K gold plating.

Size guide

How to measure your finger

A

Measure a ring you already have

Take a ring that fits the finger you want to wear it on. Use a ruler to measure straight across the inside — that is the inner diameter in millimetres, and it is also the ROTAS69 size. Enter it in the calculator.

B

Measure your finger

Wrap a narrow strip of paper around the base of your finger (not over the knuckle). Mark where it overlaps, straighten it and measure the length in millimetres — that is the circumference.

Size chart

ROTAS69 Inner Ø	US	EU	UK	Circumference
14.5 mm	3.5	46	G	45.6 mm
14.9 mm	4	47	H	46.8 mm
15.3 mm	4.5	48	I	48.1 mm
15.7 mm	5	49	J	49.3 mm
16.1 mm	5.5	51	K	50.6 mm
16.5 mm	6	52	L	51.8 mm
16.9 mm	6.5	53	M	53.1 mm
17.3 mm	7	54	N	54.4 mm
17.7 mm	7.5	56	O	55.6 mm
18.1 mm	8	57	P	56.9 mm
18.5 mm	8.5	58	Q	58.1 mm
18.9 mm	9	59	R	59.4 mm
19.4 mm	9.5	61	S	60.9 mm
19.8 mm	10	62	T	62.2 mm
20.2 mm	10.5	63	U	63.5 mm
20.6 mm	11	65	V	64.7 mm
21.0 mm	11.5	66	W	66.0 mm
21.4 mm	12	67	X	67.2 mm
21.8 mm	12.5	68	Y	68.5 mm
22.2 mm	13	70	Z	69.7 mm
22.6 mm	13.5	71	Z+1	71.0 mm
23.0 mm	14	72	Z+2	72.3 mm
23.4 mm	14.5	74	Z+3	73.5 mm
23.8 mm	15	75	Z+4	74.8 mm

Full size chart — exact values. The ROTAS69 size is the inner diameter of the ring (Inner Ø) in millimetres. The EU size corresponds to the circumference; UK letters may differ by ±½ between jewellers.