Turquoise (colour)

Turquoise was a light shade of blue and green named after a gemstone.

The Sixth Doctor's first cravat was turquoise with cream polkadots. (TV: The Twin Dilemma, Attack of the Cybermen, Vengeance on Varos, Mark of the Rani, The Two Doctors)

The Seventh Doctor wore a beige jumper with cherry question marks and turquoise zig-zags. (TV: Time and the Rani, onwards) eventually switching it for a single-breasted waistcoat of scarlet brocade when nearing the end of his life. (TV: Doctor Who)