Pearls are categorized by shapes, size and grade.  Below is a brief description of pearl shapes:

• Round: Round pearls are perfectly spherical – the shape most people think of when they think of a pearl. Because of their relative rarity and “classic” nature, they are highly desirable.



• Semi-round: These pearls are not perfectly round. Instead, they are slightly flattened or elongated, rather than being a perfect sphere.



• Drop: Drop pearls are pear- or teardrop-shaped. The drop can either be “long” or “short,” depending on its proportions. These pearls make attractive earrings or pendants.



• Semi-baroque: These pearls are slightly irregular in their shape. For example, a pearl which might otherwise be considered an oval, button, or drop pearl, but which is not symmetrical in nature, would be considered semi-baroque.



• Baroque: This is a pearl which is both non-symmetrical and irregular in shape. The baroque pearl can be purely abstract in its shape, or it can resemble a cross, stick, or some other shape.



• Circle:  Some pearls develop with one or more grooves or rings encircling them.
  

The shape of the pearl is one of several factors which goes into determining its quality, and therefore also its value. In general, round and near-round pearls are the most valuable, because of their rarity. Symmetrical shapes are generally considered to be more desirable than baroque shapes. Baroques, however, can be extremely unique, thus increasing their desirability.