I’m calling this the Christmas necklace, because the only time Hutch ever wears this large triangular pendant is at the 1976 Christmas party at Kiko’s. It looks like a stone inlay set in silver, but it’s hard for me to say what types of stones are used. But I can guess: the red bits in the middle might be coral, and maybe the blue areas are pieces of turquoise and opal? It is most likely a piece of Native American jewelry (Navajo or Zuni), possibly an arrowhead type of pendant with its slightly rounded sides.

Hutch wears it in: 

02-13 Little Girl Lost (tag)