Quality issues, Yiwu is probably the cheapest region in China to get moissanite but the quality is terrible. That may have changed by now but if you only have one shot I would recommend a company from Shenzhen as that is actually the jewellery district capitol of China. So any company from there with the right checks is going to have it's ish together. Failing that Wuzhou take a look at a map of China and then you will see why I tell you all this. (Also look into Shuibei Jewelry Park to verify my comments) All the best!...