199.15 carats natural hand cut old stock Blue Moon Boulder Turquoise Cabochon Lot by Xutšu. Light/medium blue and blue/green turquoise in black chert and quartz. Some really nice stones in this big lot! The symmetry of the matrix in this stone is trade mark blue moon. This is the only mine that produces turquoise that looks this way!. These cabochons are lightly backed for stability.