Multi Spinel 3mm Banded Faceted Round - 15-16 Inch Origin_Peru/Mexico or some degree of pink

or some degree of pink in between

It occurs in bright turquoise blues and darker blues as well as rust reds

Chrome-bearing fuchsite (a variety of muscovite mica) is the classic inclusion

potassium or barium

It really adds to the  look of these interstellar objects and creates even more eye-catching appeal

Multi Spinel 3mm Banded Faceted Round - 15-16 Inch Origin_Peru/Mexico or some degree of pinkSpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.