The best grade of ammolite which is used in making premium Ammolite Jewelry possesses a minimum of three colors from different color families. The main color families are blue (along with purple), red (along with yellow and orange), and green. Also, higher concentrations of certain rare hues increase the overall value of ammolite jewelry. Wondering about the rarest color of ammolite? Well, purple is the rarest. This means that the more purple in a piece of ammolite jewelry, the greater its value. Crimson and gold are also seen to have similar effects.