The color: Ceylon Sapphire
Description: This vivid yet deep cobalt looks blue-black in indoor lighting, but shows off its spectacular dimension in direct sunlight.
Who it works for: Women with naturally dark brunette to black hair, especially those who have complexions with cool, neutral, or olive undertones. The green-blue tones in your skin will be quite complementary to this rich cyan color.
Technique: Before this transformation, Edelman's model had naturally black hair with blond highlights. The colorist then made her entire mane sapphire. "If you have an existing medium/light blond hair painting, ask your colorist for a deep-blue semipermanent single process," she advised. "I like to use Pravana Vivids blue mixed with a splash of violet and black."