Vintage Boho Pendant necklace triangle Red and steely blue/gray. 1970s 1980s

In very good condition. Barrel clasp at back. Beautiful colours reddish orange with steely blue. Not sure what it is made of, organic, either stone or horn/bone. It is pitted like bone or horn. Small brass spacer beads. Pendant is a triangle with the back of it being a piece of resin, not the same material as the front. measuring about 1 1/2 inches tall, overall length is 19 1/2 inches. Please see photos