Hi Simon,
Thank you for your enquiry.
Unfortunately all our full eternity rings are made to order and therefore non returnable as outlined in our returns & refund policies.
Please feel free to order one of our free ring sizers via the website that should help in determining which ring size you require. Another option may be to take one of your wife's rings into a local jeweller who will be able to confirm the size she requires.
If you have any further questions please do not hesitate to contact me via email or on 0845 084 1200.
Kind Regards
Roberto Rodriguez
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