MATTE Purple Sardonyx (dyed) 10mm Star Cut Round - 15-16 Inch Hydroxyapatite rainbow effect of light refracting

rainbow effect of light refracting off of the air bubbles inside of the stone

meaning it becomes magnetically charged from heat or friction

creamy white to pale gray or beige

It is made up of Calcite or Calcium Carbonate

MATTE Purple Sardonyx (dyed) 10mm Star Cut Round - 15-16 Inch Hydroxyapatite rainbow effect of light refractingSardonyx has a Sard base, typically of brown or black, with bands of white Onyx running through it. Sard is not Onyx, but rather a dark variety of Carnelian. Sardonyx is sometimes treated to bring out its reddish tones. It is believed by some to improve memory and increase analytical skills.