I bought this topaz bracelet for my girlfriend for her birthday. I haven't given it to her yet and I recently got it out of the box and while looking at the clasp I noticed patches where it looks like the silver has scraped off. It is stamped 925 and it is illegal to stamp anything but stirling silver with 925 in Australia so I am unsure what is going on. Have I been ripped off? Or is this real 925 silver? If it is, any idea why this would happen and how to fix it before I give it to my girlfriend?