Diameter: In a round shape stone this is the overall distance from one edge to another of a diamond or a gemstone. All other shapes will use the terms L (Length) x W (Width) for measurement, the term D (Depth) or H (Height) is the measurement of a stone from the Table all the way down to the Culet.
Depth: Sometimes also referred to as Height of the diamond or gemstone, it is the measurement of a gemstone from the Table all the way down to the Culet.
Table: Is the up most flat area of a diamond or a gemstone, this area runs parallel to the Girdle.
Girdle: Is the outer edge of a diamond or a gemstone, depending on the quality of the stone it might be faceted or smooth. It is the area where the Crown meets the Pavilion. Girdles are available in “very thin, thin, medium, thick, and very thick”.
Crown: This is the area that sits above the Girdle in a diamond or gemstone, it contains the Table, Star Facets, Bezel, and Upper Girdle Facets.
Pavilion: It is entire portion of a diamond or gemstone that sits below the Girdle, it contains the Lower Girdle Facets, Pavilion Facets, and Culet. A Pavilion usually makes the bulk of the diamond or gemstone weight.
Culet: The Culet is the smallest area at the bottom of a diamond or gemstone, it is usually a point or sometime a very small facet that is parallel to the Girdle.