Do you have a ring size conversion chart to help determine the correct size to order?

Yes we do.  An international ring size conversion chart is contained within the Find My Ring Size Tool.  Once on that page click the Find My Ring Size Tool button.  You will see a tab called Ring Size Conversion that will allow you to convert to the equivalent US size from a variety of different international standards. 
In addition to the online tools available there for determining your correct size, there is also a form that you can submit and a set of plastic ring sizers will be sent to you free of charge with which you can physically size the finger in US sizes.
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