90CTS Rainbow coated quartz graduated faceted puffy coins.
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). Rainbow aura quartz does not occur naturally. Quartz crystal is a natural material, but in order for it to turn into rainbow aura quartz, it must be coated with another material that adds an iridescent sheen. In a lab different materials, such as platinum, silver, niobium, titanium oxide, and gold, are bonded to quartz's surface to add the rainbow colors.
This set of 10 coin shaped beads are wire strung with spacers and each bead is between 11mm and 17mm in size.
Origin : Africa