An illumination lamp includes a lamp base, a lampshade, and electrical contacts. The checkout device includes a scale including a base portion and a weigh plate over the base portion, a security label deactivation system between the base portion and the weigh plate, and a barcode reading apparatus including a first barcode reader adjacent the scale including a first aperture, and a second barcode reader between the base portion and the weigh plate including a second aperture. The first portion of the cord forms a watertight spiral disc that extends across the interior space to define a first area completely separated from a second area, and an outer edge of the spiral disc may be supported by a ledge extending from the inner surface into the interior space. In an example embodiment, the method is used to determine the thickness of a region within the diamond body that comprises less catalyst material than another region within the body.