Most Universally Flattering

Essie in Mademoiselle, $8
"This sheer pink (shown, top left) works on all skin tones," says Maria Salandra, owner of Finger Fitness, in Cliffside Park, New Jersey.
To Buy: 800-232-1155.

Most Versatile Red

Maybelline Express Finish Advanced Wear in Racey Red, $4
The right red (shown, middle left) looks smashing, while the wrong tone can clash with your complexion. This classic red isn't too cool (bluish) or too warm (orangey), so anyone can carry it off.
To Buy: At drugstores.

Best Bright Pink

Orly Nail Polish in Swizzle Stick, $6.50
"A nice alternative to red (shown, bottom left), especially in spring," said a tester.
To Buy: www.orlybeauty.com for stores.

Best Light Pink

Creative Nail Design in Lighten Up, $6
"It's so delicate and ladylike," said one tester of this pale rose (shown, bottom right).
To Buy: www.bebeautiful.com.

Best Biege

Rimmel Lycra Wear Nail Polish in Beige, $3
This one (shown, top right) has a subtle golden tone, which keeps it from seeming dull. "It will look great with a tan," said a tester.
To Buy: Wal-Mart stores nationwide.

Best Deep Burgundy

Nars Chinatown, $15
This rich shade (shown, 2nd from top right) suits almost anyone daring enough to try it, even those with fair skin.
To Buy: www.narscosmetics.com.

Best Color Selection

OPI Nail Lacquer, $8
"An amazing color palette (shown, 2nd from bottom right)" says Pauline Mai. The brand makes over 170 shades—with more than 25 reds.
To Buy: www.opi.com for stores.