A BLACK SOUTH SEA CULTURED PEARL THAT IS THE ONLY ONE THAT IS A NATURALLY COLOURED. THEY ARE PRODUCED BY THE LARGE, BLACK-LIPPED PEARL OYSTER PINCTADA MARGARITIFERA; A MOLLUSC FOUND IN THE TROPICAL INDO-PACIFIC OCEAN. BLACK PEARLS COME IN BLACK, BROWN AND GREY WITH PASTEL OVERTONES.