These Are the 10 Hottest Hollywood Rainbow Hair Hues, According to Stylists

The Color: Deep Sapphire

Celebrity inspiration: Lily Allen

Description: Lily is wearing a deep, sapphire jewel tone. The key to achieving the same richness is to make sure your stylist starts with the right base. “It's easiest to re-create on lighter hair, as this color requires the hair to be prelightened past the yellow tone. If the hair is too yellow, your end result will have a green undertone,” noted Papanikolas.

Who it works for: “Since this color doesn't really occur in nature on humans, it really works with anyone who has an edge and wants to push the boundaries of hair color.”