The listing, Diamond Candle Ring Collection has ended.
These rings all came from Diamond Candle or JewelScent. They're marked "Thailand" or "China", others so tiny I can't make it out even with a magnifying glass. Most likely they're just better quality costume jewelry, cz and similar, but who knows? I never found the time to have them evaluated. In any case, they're very pretty and sparkly, dazzling, but not vulgar at all.