The best way to figure it out is visiting local jeweller or any jewelry store. Professional will help you better than any home method! Here at Stellar Adron we use US size standards and you can use this trustworthy conversion chart in case if you got different standards measurements.
Internal Diameter (mm)
Circumference (mm)
US
UK/AU
EU
14.1
44.2
3
F
44
14.5
45.5
3.5
G
45
14.9
46.7
4
H
46
15.3
48
4.5
I
47
15.8
49.3
5
J
49
16.1
50.6
5.5
K
50
16.6
51.9
6
L
52
16.9
53.1
6.5
M
53
17.3
54.4
7
N
54
17.7
55.8
7.5
O
56
18
57.2
8
P
57
18.5
58.2
8.5
Q
58
19
59.5
9
R
60
19.4
60.9
9.5
S
61
19.8
62.1
10
T
62
20.2
63.3
10.5
U
63
20.6
64.9
11
V
65
21
66.2
11.5
W
66
21.4
67.2
12
X
67
21.8
68.4
12.5
Y
68
22.2
70.2
13
Z
70
ย
<div class="dynamic-checkout__content" id="dynamic-checkout-cart" data-shopify="dynamic-checkout-cart"> <shopify-accelerated-checkout-cart wallet-configs="[{"name":"shop_pay","wallet_params":{"shopId":90201030943,"merchantName":"Stellar Adorn","personalized":true}},{"name":"paypal","wallet_params":{"shopId":90201030943,"countryCode":"HK","merchantName":"Stellar Adorn","phoneRequired":true,"companyRequired":false,"shippingType":"shipping","shopifyPaymentsEnabled":true,"hasManagedSellingPlanState":null,"requiresBillingAgreement":false,"merchantId":"VZMZRLWC7BAZJ","sdkUrl":"https://www.paypal.com/sdk/js?components=buttons\u0026commit=false\u0026currency=USD\u0026locale=de_DE\u0026client-id=AfUEYT7nO4BwZQERn9Vym5TbHAG08ptiKa9gm8OARBYgoqiAJIjllRjeIMI4g294KAH1JdTnkzubt1fr\u0026merchant-id=VZMZRLWC7BAZJ\u0026intent=authorize"}}]" access-token="391ecbfbc1e45d65e0b96db2e4ddc3ff" buyer-country="CN" buyer-locale="de" buyer-currency="USD" shop-id="90201030943" cart-id="95ee797b2b5092cbedd559b34c6b8f6b" enabled-flags="["2d75a54c"]" > <div class="wallet-button-wrapper"> <ul class='wallet-cart-grid wallet-cart-grid--skeleton' role="list" data-shopify-buttoncontainer="true"> <li data-testid='grid-cell' class='wallet-cart-button-container'><div class='wallet-cart-button wallet-cart-button__skeleton' role='button' disabled aria-hidden='true'> </div></li><li data-testid='grid-cell' class='wallet-cart-button-container'><div class='wallet-cart-button wallet-cart-button__skeleton' role='button' disabled aria-hidden='true'> </div></li> </ul> </div> </shopify-accelerated-checkout-cart> <small id="shopify-buyer-consent" class="hidden" aria-hidden="true"> Ein oder mehrere Artikel in deinem Warenkorb ist/sind ein wiederkehrender Kauf oder ein Kauf mit Zahlungsaufschub. Indem ich fortfahre, stimme ich den <span id="shopify-subscription-policy-button">Stornierungsrichtlinie</span> zu und autorisiere Sie, meine Zahlungsmethode zu den auf dieser Seite aufgefรผhrten Preisen, in der Hรคufigkeit und zu den Terminen zu belasten, bis meine Bestellung ausgefรผhrt wurde oder ich, sofern zulรคssig, storniere. </small> </div>
Die Auswahl fรผhrt zu einer vollstรคndigen Seitenaktualisierung.