The south seashell pearls come from the oyster shell where they are ground and molded into beautiful luster shell pearls,These are not the actual pearls but the inner shell that surrounds the oyster pearl.After experienced 16 professional and technical processing, the seashell pearls will not fade or change the color from sweat, perfume, cleaning .They are sending up natural glittering in the sunlight, which is the Pearl's treasures.the beads for the size are 20mm.the length of the string is 16inch.