The unquestionably airtight science of color psychology would probably stipulate that blue is a calming shade. Something about its association with the sky, sea, and other nature-type things. That's all fine and dandy, but consider this: Blue on the nails is actually quite energizing. Be it warm or cool, bright or muted, it's almost universally flattering. Additionally, it gives nails a much-needed pop of sophistication after all those times you've found yourself standing in front of the nail polish wall at a manicurist thinking, “Ah well, guess I'll just go with BBF again.” BBF is fine. Blue is better. These blues in particular:

Best cerulean : YSL Bleu Majorelle

Best pastel : Tenoverten Austin

Best royal blue : Chanel Vibrato

Best bordering-on-seafoam : Smith & Cult Bitter Buddhist

Best verging-on-gray : Dolce & Gabbana Jaipur Blue

Melissa Karl photographed by Tom Newton. Nails by Tenoverten with The Foundation base coat and The Shield top coat—check out their newest salon in New York's Financial District on Fulton Street.

On the nail: Read more polish roundups, including the very best metallic and pink shades.