Answer:  

Mr. I.T., who is an expert in mica, kindly answered the question above.
 
 
I assume that you are asking about mica-based pearl pigment used in cosmetics. The pigments that have the luster of natural pearls are generally called pearl pigments. People have been using pearl pigment since the 16th century. At that time, they used the scales of swordfish for the pigments.
  

Although mica is often thought to have its own particular color, the different colors of micas are produced by the optical reflection of their multiple layers. The theory behind the colors of mica is same as that of rainbows or soap bubbles (neither the rainbows nor soap bubbles have their own color). We see the different colors through the light interference of the mica base and the thin film of titanium dioxide coating the base. We can create different colors by changing the thickness of the titanium dioxide film.

Cosmetic grade mica Courtesy of   RAESIN IMAGES

 
 
Acknowledgement
We would like to thank Mr. I.T for his kind answer. 
 
 

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