Buying rings online can be difficult, especially if you’re buying one for someone else and you don’t know his or her ring size.
Generally in order to determine ones ring size you’ll need to use a specialized tool but not this time. All you need is an internet connection, a computer with camera or laptop, and a standard size card (ATM card or credit card).
Visit findmyringsize.com and figure it out.
Don’t worry they won’t charge you on using the site. ATM card or any standard sized card is use only to calibrate the display of your computer’s camera and the site’s measuring tools. No identifying detail of your card be used or captured in any manner.