Luxury Vintage Silver Gold Onyx and Pearl Women's key pendant

This is a sterling silver and 18kt gold intricate filigree key pendant, with an onyx center and 4 small pearls. All real all authentic. I forget the name of the designer, it has a P G on back of pendant necklace attachment. I know I paid a mint for this . I’ll be researching about it. If you know about this piece. Please leave me a note. No necklace included