i have an old necklace that appears to be bone. the main pendant appears to be a carved budda but with a tan color, i have photos, it has 6 heavy carved beads. the carvings appear to be heads. each bead has a black bead with silver dots above and below the beads and pendant. the beads and pendants are connected with what appears to be an unusual sterling silver link chain. could you tell me about this chain?