Pavilion Bottom portion of the stone, under the girdle, measuring to the culet.

Pinpoint A pinpoint is a small dot, which is an inclusion within a diamond. A gathering of pinpoints is called a "cluster" or "cloud." A clout or cluster can appear as a hazy area in the diamond.

Polish Indicates the care taken by the cutter in shaping and faceting the rough stone into a finished and polished diamond.

Poor Cut Cut refers to the angles and proportions a skilled craftsman creates in transforming a rough diamond into a finished diamond. A poorly cut diamond can be either too deep or too shallow. A deep or shallow cut diamond will lose or leak light through the sides or bottom. This results in less brilliance and value.

Princess Cut A square or sometimes rectangular-shaped modified brilliant-cut diamond.

Prong or claw setting It consists of four or six claws that cradle the diamond. Because this setting allows the maximum amount of light to enter a stone from all angles, it sometimes can make a diamond appear larger and more brilliant than its actual weight. This setting can also hold larger diamonds more securely.

Proportion The proportions of a diamond are very important, so that the maximum amount of light can be reflected off and out of the stone. Proportion is the relationship between the angles of the facets of the crown and pavilion.