I haven't had any trouble with their antique gold jewelry which wears very well. In fact, it doesn't seem to rub off to make a silver colour unlike Gucci gold hardware metal. Seems like the base metal for antique gold is a dark brass so it matches the vintage look.
However, it's different from their polished gold jewelry, which I have no experience with. @hightea_xx has this necklace. He can tell you how it's lasted.