I love blue Peruvian opal, the glow is just incredible and the "kind of blue" that mesmerizes, like a blue lagoon in the middle of the jungle or that blue water holes deep enough that had been never explored fully, endless and intriguing.
MerPeople has a focal element with a talismanic feel with one of this stones set in it but matte in finish, like older, while the other blue faceted opal has a polished finish with some rustic feel, like hand cut in its irregular shapes. Guatemalan hollow beads add contrast and beauty while the white marble stones -Thanks Kurt!- add a relaxing feel in contrast with the intense glow. Small also Peruvian opal heishi finish the piece that ends with a hand crafted clasp in a piece that jut needs the breeze on the hair and its salty taste  to feel like being submerged in nature.
The pictures where the piece rests on the bust show how it would look on you since it is a human size mannequin.
 
It measures around the neck 19 1/2 inches