Round pearls are perfect in their shape but to grow a perfectly round cultured pearl is very rare among salt water culture pearls. Almost round pearls have been pressed a little and therefore not perfectly shaped. Oval pearls are most often completely symmetrical and broad in the middle while thinner at both ends. Button formed pearls are almost formed as an ellipse and while flat, they have beautifully rounded shapes. Button shaped pearls are also seen as symmetrical. The drop-shaped pearls, which are likewise considered symmetrical, will often be used for earrings and charms. Semi-Baroque pearls lack symmetry or else they would have been categorised as either oval- button- or drop-shaped. Baroque Pearls can with their asymmetrical and irregular appearance seem completely abstract.