I have one similar, with the open back, but in my opinion, mine is prettier. Its silver, and I have used it such a lot that I got a little hole in it. They repair it for free, but I didn't sent it back, because I thought I might end up paying Customs duty for a second time when it was returned, so I got it mended at my local jewellers.
It is a little bit loose on me, so I have a tiny piece of blutack stuck inside that just stops it slipping on my finger.