Guerlain Yellow It-stick (603) is a very warm-toned, medium gold with a pearl finish. It is a discontinued lipstick that retails for $37.00 and contains 0.12 oz.
Guerlain Yellow It-stick (603) Rouge Automatique ($37.00 for 0.12 oz.) is described as a "golden tone." It's a brightened, yellowed base with fine gold shimmer. It's supposed to have an "iridescent, sheer finish" for a "barely there look," so as you might expect... it is sheer. If you wanted to wear bright, sunshine yellow on your lips, you're out of luck. If you wanted a sheer layer of golden shimmer, this is your speed. It has a lightweight, very emollient, wet-like feel on the lips, so it glides on without tugging. On its own, it lasts only two hours, making it one of the shorter-wearing shades I've tried in the formula, though it was hydrating. MAC Highlights (LE, $16.00) is lighter. Tom Ford Beauty William (LE, $32.00) is more pigmented, less glossy. NYX Mischievous (P, $6.00) is more pigmented. Tom Ford Beauty Solar Gold (LE, $49.00) is very similar. MAC Playland (LE, $16.00) is more shimmery/pigmented. Dolce and Gabbana Topazio (LE, $33.00) is darker, more pigmented. Guerlain Altoum (LE, $35.00) is more sparkly. Obsessive Compulsive Cosmetics Triptych (P, $18.00) is more pigmented, more shimmery. See comparison swatches / compare dupes side-by-side.
Rouge Automatique hydrating long-lasting lip color: automatically fashionable. Coveted as an It Bag, precious as a gem, glamorous as stilettos! Open and close with just one hand. Its innovative formula combines long-lasting hold with comfort and radiance. Rouge Automatique offers a burst of color, available in a bouquet of 25 shades.