South Sea cultured pearls typically range in size from
8.0mm - 16.0mm in diameter, and much more rarely in the largest possibles sizes up to 20.0mm+ in diameter.
South Sea cultured pearls of the White-Lipped variety naturally occur in different intensities of white and naturally have overtones of pink, green, and silver in varying degrees and combination.
South Sea cultured pearls of the Gold-Lipped variety naturally occur in different intensities of ivory, champagne and gold, and naturally have overtones of pink, green, and silver in varying degrees and combination.
This is apparent when you look at the Mother of Pearl that lines the oysters' shell. As with all pearls, the parent lining is a clue as to the expected colour of pearl the oyster will produce.
A high quality round South Sea pearl that displays a strong overtone is not common. These striking overtones are most often displayed in the keshi or baroque shapes of a South Sea pearl.
South Sea cultured pearls occur in a variety of shapes; such as round, near-round, off-round, and baroque. All factors being equal, the more perfectly round the pearl is, the more valuable it is.