Beautiful Statement Artisan Handcrafted Shell Glass Beaded Chunky Necklace Beach

Quartz & shell with bronze glass With Heishi beads. Not sure what these are made of Shell attached to black gemstone or a type of resin plastic Purchased few years ago from an Artisan craft show 21" total length. Can be adjusted for shorter lengths. Can be worn shell side up or black side up chip in couple heishi beads does not deter from look or wearing