I'm pretty sure you can get it serviced by the official stores or stockists if it is an authentic second hand piece and she has the certificate of authenticity or she could even pay to get it authenticated. It is expensive, but if you actually owned an authentic piece and wanted it to hold it's value then that is definitely something you would do... I'm not convinced that all of Molly's jewellery is real, I think some of may be, but some is not. Van Cleef and Cartier pieces hold a lot of their value second hand, especially if they are looked after well. It's pretty standard that with any high end jewellery or watches that they must be serviced by them or sometimes an affiliated stockist to retain the guarantee and authenticity. I don't own any high end jewellery but I know this as some of my family have high end watches and this was always recommended and highlighted. My family have moaned to me about the price of services and battery changes, but it was worth it as once their watch was accidentally damaged during a battery replacement, but as it was done by an authorised repair person everything was fixed without any extra charge and using authentic parts. Surely Molly should know this as someone who is very into designer gear, either she really doesn't know very much about the things she says she is passionate about or she is lying to try and pass up a fake as authentic....