Matched pair for earrings or cuffs.. Cloud Mountain' or more accurately Yungai Mine is famous for producing the highest gem grade quality turquoise in the world. The best spider web and darkest blue was often sold and traded as the famed Lander Blue Mine Turquoise. Very little is being extracted from these older claims and it is quite rare to be able to acquire this amazing material in high grade. All natural, highly silicated and rare.