I personally sourced this Large triple strand statement shell necklace on a recent trip to Bali.
Wow.. it is a real statement and fairly heavy. Rough brown cord has been wrapped to form a thick band which is covered with the same brown cord, a bunch of flat shells have been hand stitched into the cord sitting on a large cut disc of shell. It then splits into three strands all different lengths so they sit just right, made up of multiple white spiral mollusc shells..
This necklace is not adjustable, there are no closures, just pop over your head, the overall approximate length is 90cm.