Smoky Quartz 3mm Banded Table Cut Cube A Grade Bead - 15-16 Inch 4x10mm and this can be confirmed

and this can be confirmed under magnification

it can feature a striking mix of both green and blue in the same stone

It should be cleaned with a damp cloth and avoided from getting wet

giving some rubies a slightly brownish or purplish tint

Agate has been discovered with artifacts from cultures of the Neolithic Period

Smoky Quartz 3mm Banded Table Cut Cube A Grade Bead - 15-16 Inch 4x10mm 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.