Sapphire
From Tardis Wiki, the free Doctor Who reference
Sapphire was a gemstone.
The Toymaker wore a large sapphire ring on the middle finger of his left hand, which he used to manipulate his Celestial Toyroom. (PROSE: The Celestial Toymaker)
A planet made of sapphire was destroyed by the Night Sun before it knew its own strength. (AUDIO: Night Watch)
