Yeah, I really understand you because it will be embarrassed when get the fake Cartier sunglasses as a gift. Now and here I will tell you some easy methods to tell the sunglasses’ authenticity. The first one, also known as the easiest one, is that you can get your answer from the price you spend although it is not fool-proof, it is helpful. We all know most Cartier glasses are priced in the $200 range, and if the Cartier sunglasses cost you much less than this range, then maybe the sunglasses you bought are fake. Besides, you can check whether the sunglasses have serial number, if they do, then you can check their authenticity with the serial number. The last, but also the important one, is that you can get your answer from the screws. Maybe you do not know, but it is a fact that Cartier sunglasses use only metal screws. Screws made of plastic or any other material except metal are a sign of a fake.