There are 9 different crystals used by the Kryst, as part of their culture. The colors from weakest and most common to strongest and the rarest are Red, Orange, Yellow, Green, Blue, Indigo, Violet, and then White and Black, which are of equal strength and rarity. No matter the power granted it will always be tinged with the color of the Crystal, except for the White crystal which allows one to make their power/ability seem to be any color, which is why it is more heavily regulated than the others.
There are layers to the power granted by the crystals:
First layer, the three colors in the first layer are the most commonly found crystal types, and they can grant similar levels of power depending upon the ability. (The ability to create fire by manipulating heat, will be used a common example for color comparisons.)
Red: one can create a fireball the size of a fist and direct and move it anywhere within a couple feet of themselves.
Orange: One can create a fireball the size of a grapefruit or the equivalent, and move it within a fewfeet of themselves, destructive power is the same as the red fireball.
Yellow: One can create a fireball the size of a persons head or the equivalent, and move it within several feet of themselves, destructive power is the same as the red fireball.
Second Layer: The second layer serves as a divider of sorts, it has much more power than the previous layer but less than the following. The color here is uncommon but is still more numerous than the remaining 5 colors by a long shot.
Green: One can create multiple large fireballs or cloak themselves in a sheet of flame for a short time. It is Much more destructive and versatile than the previous colors.
Third Layer: From this layer onwards the colors of crystals are rarer and much more powerful that the previous ones.
Blue: One can create small constructs or the like out of heat and flame, but they last a short time and cannot leave your person.
Indigo: Constructs can fly around within a few feet of your person and you can cook small things with your touch after a period of time.
Violet: Can cook and heat larger things and your flame constructs can be more complex and larger.
Fourth Layer: within this layer is the rarest and most powerful of the Colored Crystals, they are also the most peculiar. The two colors in this layer have some interesting peculiarities and unlike the other layers are not relatively equal in destructive power.
Black: You can form fireballs but not constructs, you can burn things to ash but not heat them. This Colored crystal is much more destructive than any of the others, and you cannot do as many things with it. It is the far more powerful of the two in this layer.
White: You can form many constructs and heat things with great precision, but you have less destructive power than the counterpart crystal. However what this lacks in destructive power, you gain in versatility, being able to do so many more things than the other colors with much more precision and control.