Your search for "bone necklace" revealed the following:
Bone Teardrop Pendant Vintage
$12.00Vintage hand carved bone pendant in a tear drop shape. It has circular ridges around the top, middle and bottom. Small eyes...
Bone Mask Pendants Vintage Tribal
$7.00These are carved bone pendants in a Tribal or BOHO style. They look like African Tribal face masks. They are carved out...