7mm to 8.5mm Ferrous Quartz faceted round Black Gold .925 Chain sold by the foot with approximately 23 beads length. Our custom manufactured hand-crafted gemstone rosary chain sold by the foot is measured as 3 quantity = 3 continual feet. Ferrous Quartz is a Crystal Quartz body having Iron internal characteristics which have grown within the crystal structure of the Quartz gemstone body.