How can I know if they are real or fake sunglasses?

Hi. There is a girl selling Roberto Cavalli's sunglasses. Of course second hand!!! She claims that she is selling less than half price!! She says it has guarantee of Roberto Cavalli and it is in its own bag blah blah... and She says she has bought it around 300 dollars but now is selling around 130 dollars. Ok after all how can I know if they are real. She has only shown picture of the glasses and bag and cleaners on net. But how can I know that they are not fake? She even says there is "care booklet" in it and on the skin sides there is signature of Roberto Cavalli. Should I trust and buy?

How can I know if they are real or fake sunglasses?
if u can't tell the difference, what makes u think that other people will b able to tell?! Go 4 it!! : )
Reply:go online and check the price of real ones and then if theyre 30% off, try taking 30% off of it and check other websites too for other real prices. hope this helps!
Reply:It all depends if you know this girl. If not go to the website, and there should be something like this.





http://www.abercrombiekids.com/kids/life...








This states brand protection because people are trying to sell knock offs, I think that there might be one for that designer too. Just go to their website. Hope this helps.
Reply:absolutely not. believe me, it's a bad bad idea. i would inspect them firsthand. they make fake dior glassesthat actually say dior and such... it's a bad idea. you can get cute cheap sunglasses other places that look great. who cares if it's designer, but i'd care if i paid 130 dollars for glasses that weren't real.