Unsurpassed in helping the designer determine the most pleasing stone shape and size ratio, as well as for adjusting wax models before casting ordering stones. Contains 168 shapes, sizes and length-to-alt ratios for all the popular cuts: oval, pear, marquise, emerald, round, square and heart shaped. Features bold outlines and gemologically correct facets for maximum visualization. The set consists of 12 rules in protective, easy access, white sleeves within a sturdy, vinyl binder.