black onyx crescent moon with opossum vertebra and squirrel toe bones

Black onyx crescent moon cabachon set in a handmade serrated bezel rises above solid sterling silver castings of an opossum vertebra and squirrel toe bones.
Necklace chain is oxidized and 18" long with lobster clasp closure.
Centerpiece measures 1.25" wide
Onyx measures: 26mm x 31mm