3 beaded necklaces young adult surfer beach arrowhead black metal blue brown

Three beaded necklaces One is just a shell touristy necklace from Hawaii. The other two I did buy in Hawaii for my kids when they were younger. One is a white blue and green beaded necklace the other with metal blue and black beads with an arrowhead pendant. The arrowhead is attached to the chain with what looks like a keychain. I think it was modified by my son.