MAC I'm the One is a very cool-toned, medium-dark pink with a natural finish. It is a limited edition blush that retails for $24.00 and contains 0.21 oz.
MAC I'm the One Blush ($22.00 for 0.21 oz.) is described as a "mid-tone blue pink." Like I'm the One, this shade darkened the minute it touched the skin. It looks lighter in the pan, but swatched (and applied!), it is a lightened, medium pink with strong blue undertones--it almost has a lilac-edge to it, but it's still very much pink first. It has a satin finish, so there is a very subtle natural sheen that's most apparent the more blended out it is. NARS Gaiety is incredible similar on--swatched, it appears marginally lighter (and for darker complexions, it is more pigmented). MAC Peony Petal is darker, slightly more magenta but the difference is negligible on.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
Designed by and for professionals. Formulated to provide fantastic colour with ease and consistency. Applies evenly, adheres lightly to skin to achieve a natural-looking application of colour that stays put all day. Five finishes -- Frost. An iridescent, lightly shimmering color that adds highlights and a frosted bloom to your cheeks. Matte. A flat, matte finish that goes on lightly, builds well and blends with the skin. Satin. A light-refractive sheen-style finish that adds subtle highlights to the skin. Sheertone. A sheer-on micro-refined powder with a non-transparent finish that goes on faint and looks real. Sheertone Shimmer. A jet-milled and micro-fine powder with just enough shimmer to make light dance on your cheeks.
TALC, OCTYLDODECYL STEAROYL STEARATE, ZINC STEARATE, ISOSTEARYL NEOPENTANOATE, TOCOPHERYL ACETATE, CAPRYLYL GLYCOL, HEXYLENE GLYCOL, PHENOXYETHANOL. MAY CONTAIN: SILICA, MICA, TITANIUM DIOXIDE (CI 77891), IRON OXIDES (CI 77491, CI 77492, CI 77499), BISMUTH OXYCHLORIDE (CI 77163), BLUE 1 LAKE (CI 42090), CARMINE (CI 75470), CHROMIUM HYDROXIDE GREEN (CI 77289), CHROMIUM OXIDE GREENS (CI 77288), FERRIC FERROCYANIDE (CI 77510), MANGANESE VIOLET (CI 77742), RED 6 (CI 15850), RED 6 LAKE (CI 15850), RED 7 LAKE (CI 15850), RED 28 LAKE (CI 45410), RED 30 LAKE (CI 73360), ULTRAMARINES (CI 77007), YELLOW 5 LAKE (CI 19140), YELLOW 6 LAKE (CI 15985).
Disclaimer: Ingredient lists are as available by the brand (or retailer) at the time of publishing. Please always check product packaging, if it exists, for the ingredient list applicable to the product you're purchasing, or the brand or retailer's website for the most up-to-date ingredient list.