210 carats natural hand cut old stock Blue Moon Boulder Turquoise Cabochon Lot by Xutšu. Light/medium blue in black chert and quartz. This lot showcases the natural beauty of the matrix that comes from this mine. This big lot makes for some pretty awesome combinations for jewelry! 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.