There is a 6 month warranty on all my pieces. If there is a manufacturing default (NOT wear and tear) I will repair your piece for you asap! If for some reason it is irreparable you can receive a refund.
If you buy the wrong size I can re-size the ring for a fee. This will also depend on how much of a difference between sizes. If it is a vast difference it may not be possible without compromising the structure of the ring. If this is the case you will have to pay to have a new ring made unfortunately.
Please note that some styles of rings cannot be resized so make sure you find out the correct ring size before ordering!