Authenticity Guaranteed. These Guess by Marciano sunglasses GM625 in tortoiseshell are made to a very high standard & come with branded case, & authenticity card. Buy designer shades at legallyglam.com. These sunglasses come with a Guess manufacturer's 12 month guarantee. Brown Gradient lenses Tortoiseshell plastic frames Designer 'M' motif on side arm 100% UVA & UVB protection lenses One years manufacturer's guarantee