VTG Sterling Double Strand Black Onyx/Tourmaline Carnelian Marcasite Necklace

Vintage Tests as Sterling Silver Double Strand Black Onyx or Tourmaline Carnelian Marcasite Pendant Approximately 32" Necklace. Pendant is a brooch, but it doesn't come off. It's part of the necklace. At one time, I think there may have been a third strand on this beautiful necklace. Hand knotted. Black beads register in the tourmaline section of my gem tester. I believe the red beads may be carnelian. Lovely piece in excellent vintage condition.

N1461