Shape of Gallstones

Their shape depends upon their consistency as well as number. When soft, they may be flattened, and when hard, they may contain facets when crowded together; others are oblong, oval, or egg-shaped, depending upon pressure against each other. On section, the stone often shows a nucleus of cholesterin, the remainder being made up of concentric layers, the outer layers containing the various salts, being brown and hard.

Mostly Shape varies from round, oval to irregular.