Found off the coast of the French Polynesian islands, Tahitians are the world’s only naturally black pearl. Like the South Sea Pearl, a Tahitian pearl can grow to be quite large - as much as 18mm. More than for their size, however, Tahitian pearls are treasured for their incredible colour. Though they are most often associated with deep black, they naturally come in an extraordinary array of shades, ranging from silvery greys to rich greens.