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4. Cosmetics: Nail polish
(from left to right)

Best for fair skin: OPI Infinite Shine 2 in Excuse Me, Big Sur!
When picking a nude polish, do you tend to think pink? Then this rosy shade will be your best bud. The streak-free formula has peach undertones, creating just enough contrast against fair skin.

Best for medium skin: Essie Gel Couture Gala in Front Page Worthy
For a manicure that shines bright like a diamond—well, a sapphire at least—apply two coats of this pearlescent blue polish, especially dazzling with medium skin tones.

Best for dark skin: Dr. Dana 9-Free Nail Color in Judy
Give this hardworking polish a hand! The crimson is classic, the formula is free of nine potentially harmful ingredients, and a portion of the sale goes to charity.