Most clouds are made up of crystals too tiny to see individually even under a 10X magnification. Crown is the upper part of the diamond above the girdle. Culet is the tiny facet on the pointed bottom of the pavilion, parallel to the table. Cut refers to the geometric proportions of a gemstone. The cut of a gemstone is one of the most important factors in determining how much sparkle a gemstone produces.
Depth is the height of a gemstone measured from the culet to the table.
Depth percentage is the height of a gemstone, measured from the culet to the table, divided by the width of the gemstone. The depth percentage is critical to creating brilliance and fire in a diamond. A gemstone with a depth percentage too low or too high will lack sparkle. Facet is the flat, polished surface on a diamond. A round, full-cut diamond usually has 58 facets.