South Sea pearls, which grow off the coast of Australia, are world-famous for their rare brilliance and incredible size—ranging in average from 8 to 20 mm. As the rarest pearl on earth, the South Sea pearl is also one of the priciest, since a single necklace of uniform pearls can take years and several harvests to assemble. Ranging in colour from lustrous white to deep gold, South Sea pearls are the ultimate in luxury and glamour.