41.8 carats old stock natural hand cut free form Blue Moon Boulder Turquoise Cabochon by Xutšu. Deep blue and green turquoise in quartz. This is a very hard high quality stone, the beautiful 'reversed' webbed turquoise in the quartz host rock is a very rare combination! What a great addition to any collection! 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! This cabochon is lightly backed for stability.