Handmade Chip Mosaic and Coral Bead Necklace in Sterling Silver and Brass

Very worn old tube bead necklace. Each bead is constructed in sterling silver with brass accents. Each bead in inlay set with turquoise chip mosaic and red coral. The necklace is 21 1/2" long. The beads are 19mm long and 6mm wide. The silver has wear, but I don't see any chips in the mosaic. 

They could be Mexican or Navajo. They were restrung at one time and a lobster claw clasp was added. They are on wire. Weight: 68.4 grams. Very rustic.