Bests & Worsts Reviews from Amazon

I love Ray-Ban sunglasses and have numerous pairs in my collection. I had purchased the flash green-mirrored aviators a few weeks ago from Sunglass Express which indeed were authentic (compared thoroughly with the pairs in my collection). Loved them- beautiful fit & perfect condition. As I was incredibly happy with this pair, I decided to purchase another pair from Sunglass Express (packaged by Amazon). The pair I purchased were the 55mm Brown Gradient Aviators. 1. It did not come in 55mm, the pair shipped to me were 58mm. 2. They were 100% non-authentic. Yes, they did have all the signature Ray-Ban markings, BUT I knew as soon as I took them out of the case that the quality did not feel right. I then proceeded to look closer at the sunglasses and although markings were in the correct place, the "RB" which is supposed to be ENGRAVED on the right side of the sunglass frame was simply sketched. The RB was flat, unlike my authentic Ray-Ban aviators, which you can feel with your nail that it is indeed engraved in the glass. This leads me to... How can a company sell some sunglasses which are authentic & some which are not? Please, please beware of this simple way to find out if your Ray-Bans are NOT replicas. DO NOT purchase the Large Metal Gold Gradient Ray-Bans, you will not get what you paid for.