Vintage Eliat Stone Sterling Silver Necklace Pendant Greek Key Unique blue

Vintage Eliat Stone Sterling Silver Necklace Pendant Greek Key Unique I fell in love with the unique shape of the sterling silver circle opening to reveal the stone. The stone is a greenish blue that changes color according to the light. I believe it’s either an Eliat stone or Chrysocolla. Approximately 1.5” in length and width. In excellent vintage condition! Thank you!