Prismatic Gem

Prismatic Gems change the color of Unusual effects. They can only be used on custom couriers with an Unusual effect (Socketed with an Ethereal Gem) and the Fractal Horns of Inner Abysm Arcana.

Legacy
Legacy color gems are displayed as Prismatic: Legacy (#,#,#) where # is the RGB value of the color.

Explain legacy info here -Lemon

Compatibility
''Explain compatibility with ethereals here, make table? -Lemon''
 * All prismatic gems can be socketed into Terrorblade's Fractal Horns of Inner Abysm to change the colors of his head, chest, weapons, footprints, spells, and enemy death effects.

History
Colors were previously changeable using Unusual Paint, a limited item. This was changed with the November 14, 2013 Patch.
 * All Unusual Paints were converted into Gem Packs.
 * Gem Packs contain a corresponding color gem and an Artificer's Chisel for creating a socket.