The Radiant was first introduced in 1976. Semi-mount is a setting which is complete except for the main stone, which will be selected separately. Single-cut is a diamond with only 16 or 17 facets. Symmetry is the description of the uniformity of a gemstone's cut. The scale for symmetry ranges from poor to excellent.
Table is the large, flat, top facet.
It has an octagonal shape on a round brilliant diamond. Tiffany is a simple, elegant 2-3 mm ring setting with a head that holds a single diamond.