Natural Magnesite Round Bead Strands, Dyed & Heated, Medium TurquoiseSize: about 10mm diameter, hole: 2mm; about 40pcs/strand, 15.55 inch.â This stone is from Xinjiang, it is known in the trade as Turquoise because of its blue-green hues(dyed & heated treated), similar to turquoise in appearance. It is actually Magnesite.