Compare Pearl Necklaces – What Pearls to Buy? _ This comparison chart for different types of pearls will help you get an overview of pearls at a glance. The pearls tend to be less expensive at the top of the list & higher priced as you go down the list. Sizes range as follows. Both Tahitian & South Sea pearls may be sold either as round pearls (shown here) or as Baroque pearls. The baroque pearls tend to be less expensive & more easily available than perfectly matched round pearls.