Real Fendi sunglasses come with a certificate of authenticity and warranty inside of the packaging. This certificate should come in an envelope, as a card. One side of the card is with the Fendi logo. Wrong spacing and alignment is a sign of the fake glasses. The other side of the card is with Fendi hologram. This hologram has to switch from dark to light colours of tiny Fendi logos around Look at the inner parts of sunglasses - check the spelling of Fendi and check if there is “Made in Italy”. All authentic Fendi’s should have CE letters on the right temple arm (for European Conformity). At the outer part of temples must be the name Fendi in capital letters.