Alternating rectangular shape Sea Sediment Jasper beads with sterling silver 4 mm beads make this 16” necklace unique and beautiful.   Sea Sediment Jasper is a trade name for a patterned chalcedony quartz widely used in jewelry. It is known for its ocean-like, swirling veins and vivid colors. In crystal healing, it is primarily regarded as a Stone of Stability that is believed to bring emotional balance, peace, and inner clarity.