http://www.starwars.com/databank/lightsaber-crystal
So this link leads to the Star Wars Databank on Kyber Crystals.
Of note is the last part where it explains that a Kyber Crystal's color is clear "colorless until first attuned and connected to a Jedi -- at which times it glows either blue or green, or in some rare instances, another shade. From that point on, it retains that hue." This is all new information to the Star Wars universe for me and I have been following since.. well... the beginning? What do you guys think of this. That use of the word "attuning" adds something to Force Users that I am not 100% on Force and Destiny covering. I wanted to bring it to the communities attention (and FFGs).