Photos: Courtesy of companies

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5. Cosmetics: Nail polish
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Best for fair skin: OPI Infinite Shine in OPI Red
Do you find yourself torn between sweet and spunky? This long-wearing, high-shine polish—a flattering bright pink-red tone—is just for you.
$12.50; Ulta.com

Best for medium skin: Sally Hansen Color Therapy in Mauve Mantra
This rosy polish is twice as nice: A blend of argan, acai, and primrose oils helps strengthen and moisturize nails; the shimmery finish beautifully complements olive skin.
$9; drugstores

Best for dark skin: Essie Gel Couture in To Have & to Gold
One coat of this glimmering rose gold, which looks especially brilliant on mocha skin, will turn you into a heavy-metal fan.
$11.50; Essie.com