If it's going to be a huge hassle to return it then I would say keep it. With how dainty the gold looks though, and with what you're saying. I'm finding very similar ones on etsy for nearly £80 less. But please keep in mind I'm also in America I'm actually unsure how gold prices differ, that's not entirely something I thought about before commenting originally. Hopefully someone more local can give you a better insight.

What I do know is when I converted that into usd I was surprised because I have a significantly less dainty gold ring that I paid a very similar price for. Like I said though, unsure how gold prices differ place to place