I think it depends too. I have a pair of peridot studs in white gold and they were nice, never a problem. But, I did order a small diamond pendant once when I was in college for my mom on Mother's Day and the diamonds just clouded after about 2 months. It was a really good price, but the quality on that was awful. They acted like CZ, but it was only .20 points, so I highly doubt it was, it would not make sense, KWIM. Just awful quality on that, I guess.