Dyed marquise shape shell bead continuous necklace in dark pearlescent navy blue

This is a lovely dyed shell beaded continuous strand necklace in pearlescent navy blue. The shell beads are marquise shaped and there is a lot of variation in the dye, so each one is different and the color ranges from dark navy to pearlescent gray. Length is about 44” inches. Unsigned. Very good pre-owned condition. One of the beads has a rough spot, see the last photo.