How can i spot fake sunglasses?

i bought these ferragamo sunglasses that are supposed to be real. how should i know they are?|||Well, check the spelling of course. Also, Ferragamo sunglasses are made by Luxottica Company. Go to sunglass hut.com and look up Ferragamo. Find your classes on thesite and see if the style number matches the style number that should be on the inside of one of the arms of the glasses.|||Put them on and see if it is still too bright outside.|||the price!?!?! usually people who sell you fake sunglasses know that you know their fake and dont even attempt to charge you hundreds extra (Ferragmo sunglasses average around $300) . also check the logo and make sure it is identical to the real one, Coach and Chanel knockoffs are easy to spot that way. and an expensive company does not let people on the street sell their merchandise and usually mall pagodas don't sell very many high end designer sunglasses.|||There should be a serial number on the side, it should be made in Italy or France, if the price was low then its too good to be true %26amp; the quality.