The round scoring area, 12 feet in diameter, with concentric circles 1, 4, and 8 feet in diameter.
Concentric rings on the surface of a pearl. If circles cover over 1/3 of the pearl's surface, it may be referred to as a circle pearl.
Concentric rings formed on the surface of a pearl that are concave in appearance. If circles are apparent on more than 1/3 of a pearl's surface then the term "circle pearl" is applied to describe the shape of a pearl. If less than 1/3 of a pearl's surface is covered by circles, then the circle is considered a blemish and not a shape description.