Blue Marble/Gemstone Cube Pendant Necklace

Gold metal, blue/white marble, black stones. Very thin necklace. Adjustable length, lobster claw closure, there are 4 larger loops that are length options. There is a single black gemstone missing, shown in photos. Measures 16 inches to 17.75 inches (there’s 4 loops that are in that length options) No markings or brand distinguisher.