Jewel shape

Dependent upon what color jewel you have can give you a variety of abilities.

Square
Square shaped jewels refer to a physical use of the power.

Close ranged use or physical contact.

Triangle
Triangular shaped jewels refer to a ranged use of power.

Abilities can be used at a distance.

Other
Other shaped jewels refer to a mixture between the two.

Can use close and far ranged.

Weaker than those who just use one.