How can I spot original gucci sunglasses from fake?

I purchased a pair of Gucci’s sunglass from an store in Israel.
I don’t think they are original gucci sunglass,┬ábecause the imprint in the inside of the sunglasses rubbed off GUCCI now shows GUCC.
The second reason the case seems like its made of poor quality.
I googled the style number and a different frame came up.
Help please!! thanks
Hi thank you approx. $200….but do you know if the imprint on the inside of the handle should rub off?