Ruby (colour)
From Tardis Wiki, the free Doctor Who reference
Ruby was a shade of red named after a certain gemstone.
The Fourth Doctor wore a ruby cravat as part of his detective outfit. (PROSE: Nanomorphosis, Evolution; AUDIO: The Merfolk Murders; COMIC: Gaze of the Medusa; TV: The Talons of Weng-Chiang)
The Seventh Doctor wore a ruby tie with his suit of cream linen during an adventure in the System. (PROSE: Sky Pirates!)
Nyssa wore ruby shoes during her second encounter with the Mara. (TV: Snakedance)
