I have purchased from Ebay powersellers and have been disapointed to say the least.I assumed it would be okay to purchase because of their positive feedback.The minute I opened the packages, I could tell they were not authentic. I think they bank on the fact that many people are "first time" buyers, and do not know the difference.The pieces do not have the same weight as authentic Yurman. The diamonds do not have a sparkle. The finishing work is close, but certainly not like my authentic pieces.
Luckily, the sellers have all taken returns. I can only speak for myself, but the pieces I have bought from some of the above have not been authentic Yurman.
I would reccomend buyers pay full price from the Yurman Boutique or Neimans/Saks. I lost a diamond in my ring and the Boutique gave me a new ring (a year later, no questions), Neimans has repaired(numerous times)free of charge. I am hard on my jewelry. LOL .When purchasing expensive pieces, it is nice to have this type of customer service.