Above- mentioned large-sized pearls are called South Sea pearls, which come from silver-lipped and gold-lipped pearl oyster Pinctada maxima. This oyster is one of the largest of the thirty or so species of pearl oysters found throughout the world. Its shell can grow to a diameter of 25cm to 35cm, and it can weigh up to 5kg. The natural habitats of those big pearl oyster are in warm tropical South Pacific sea waters of the Arafura Sea off Australia’s north west coast, Indonesia Archipelago, Philippine Archipelago and Myeik (Mergui) Archipelago of Myanmar. World War Two obliterated all South Sea Pearl cultivations.