Sterling silver bracelet with 1" Kingman turquoise stone tufa cast cuff . The cuff is detailed shapes that were carved into a tufa stone to create the cast for this whimsical bracelet. Tufa casting has been used for many years in Native American communities and beyond. It includes taking the tufa-stone (volcanic ash composition) carving the desired detailing into the stone to create the mold,  and pour molten silver to create the piece.