Lightsaber Crystal Colors and Crafting Information

What we have here is a list of all of the currently available colors in the game, with information on how to get them (if we've found that yet). This information was gathered from both SWTOR official forums and Reddit, from a variety of different contributors.

This list is a work in progress and will be updated as more information is found.

Black Blue
Republic Rakata Gear

Black Red
Empire Rakata Gear

Black Yellow
Pre-order Bonus

Black Green
Obtained as bonus for Razer TOR hardware - http://www.razerzone.com/swtor

Blue
This crystal pattern is learnt from an artiface trainer. High quality versions of this crystal are discovered through reverse engineering.

Cyan
REPUBLIC ONLY!!! Obtained from Columi gear, listed as "Light Blue" [LTBLUE]. Champion versions can be Cyan, but not removable.

Green
This crystal pattern is learnt from an artiface trainer. High quality versions of this crystal are discovered through reverse engineering. 

Magenta
This is one of the rarest items in the game. It is not acquired through reverse engineering. Also listed as "Light Red" [LTRED], Magenta has a few steps to do before you can get this one. Gargath, on Hoth drops a +33 Power schematic. Belsavis's Worldboss's, The Primal Destroyer, drops a +33 Endurance, a +33 Crit schematic and a +33 Power schematic.. The following are the steps for the main ingredient. Thanks to Taskcommnda