Abstract: A step-cut stone with a straight edged polygonal shaped girdle comprising: a generally pyramidal base which is provided with kite-shaped facets extending from the culet toward the vertices of the girdle and ridges along lines between the culet and the middle of edges of the girdle; and a crown with at least girdle and table breaks wherein at least one of these breaks is cut with triangular shaped facets.

Abstract: A brilliantized step cut diamond has a straight edged polygonal shaped girdle with sides and corner facets; a crown with a table and a table-and-girdle breaks which are faceted; and a pyramidal base having a point culet, a culet break and a girdle break with ridges extending from the culet to the corner of the girdle. A fan with three pairs of triangular halves is disposed symmetrically about each ridge with a triangular facet in each corner of the base having an edge which is colinear with the edge of a corner facet and an apex at a ridge. The angle between the culet break and the plane of the girdle is between 30.degree. and 43.degree..

Abstract: A brilliantized step cut diamond has a straight edged polygonal shaped girdle with side and corner facets, a crown with a table and a table-and-girdle breaks which are faceted; and a pyramidal base having a point culet, a culet break and a girdle break with ridges extending from the culet to the corner of the girdle. A fan with three pairs of triangular halves is disposed symmetrically about each ridge with a triangular facet in each corner of the base having an edge which is colinear with the edge of a corner facet and an apex at a ridge.

Abstract: A step cut stone with a straight edged polygonal shaped girdle has a generally pyramidal base and a crown with at least girdle and table breaks wherein at least one of these breaks is cut with triangular shaped facets.