VTG 1970s Shell Necklace Native Unisex 17 inches

Shell beads. Triangle pendants - 3. Inlay - green agate, turquoise, red and white jasper (we think) - with silver bench beads. Hook clasp. Unisex. No stamp: none; artisan handmade artisan. Excellent vintage condition. No issues of note. Back of center triangle looks like it has a crack but it doesn't, just the stone. See pics. Sold as is. Length 17"