Brand Guess By Marciano has always remained true to its original philosophyâ”even while experiencing significant growth in recent years. Guess By Marciano has made the ascent from humble beginnings to its present position: a worldwide leader in affordable luxury eyewear. Guess By Marciano uses state-of-the-art materials to craft their signature eyewear frames: premium cellulose acetate, ultra-lightweight titanium, and color-rich stainless steel.