Smoky Quartz 6mm Star Cut Coin - 15-16 Inch hps_10042023 and this can be confirmed

and this can be confirmed under magnification

Viking explorers used thin pieces of Iolite as the world’s first polarizing lens to help them determine the exact location of the sun for navigation

consisting of opaque rust-red glass with tiny flecks of glittering copper suspended within it

sapphires get their various colors from trace elements

This stone is considered to have many different metaphysical properties

Smoky Quartz 6mm Star Cut Coin - 15-16 Inch hps_10042023 and this can be confirmedSmoky Quartz is a translucent smoky brown or gray variety of Quartz. It ranges from almost completely transparent to an almost opaque brownish to gray crystal. The color of Smoky Quartz is due to natural irradiation and traces of aluminum within the crystal lattice of the stone. Smoky Quartz it the national gem of Scotland, where it was mined since around 300 BCE.