Correct me if I'm wrong, but I thought that Diamond's International (a presence in the US) was a reputable merchandiser, and stood behind their jewlery. I have purchased several pieces over the years and the quality of the items have been backed with an appraisal and certification matching the purchase. When I had an issue with a clasp, they gladly had me mail it and paid the postage both ways and replace the defective piece quickly. I have had some of my purchases looked at and they are what they were said to be. Its like most things, buyer beware.