So after OH and I got engaged we sat down together and started looking at rings. I found the perfect one on Etsy from a seller who has a ton of good reviews. We ordered it, paid for it and waited and waited for it to arrive from Florida. Unfortunately when it got here I tried it on and it's miles too big!
I checked the size of my ring finger what felt like a hundred times and at every possible time of day so I was certain I needed a J1/2. Checked all sorts of conversion charts and they all said that J1/2 is a US size 5 so that's what I ordered. The engagement ring however fits, slightly loosely, on my middle finger which according to my ring sizer is an M which makes the ring 2 and a half UK sizes too big.
I've been in touch with the seller and he's offered to pay for it to be resized over here so I don't have the hassle of sending it back to the states. I'm still absolutely gutted though as I was so excited to be able to wear my ring!!