Vintage-look Necklace

Great vintage-look necklace. This was an estate find and I do not know much about the necklace. The pendant appears to be a green slab cut stone with a marbleized/abalone look set in an ornate gold frame with tiny pink/green/clear stones or crystals. Measures 1" x 1.75" The necklace links may be jade with tiny gold ball spacers. Measures 16" length with a lobster claw clasp and a 2" chain link extender. No visible hallmarks. Pre-owned and very gently worn with very minimal signs of wear. Good condition.