The Asscher cut diamond is a unique shape with a prismatic brilliance and a rectangular-faceted pavilion in the same style as the emerald cut diamond. Normally the Asscher cut has 58 main facets and the typical ratio for the more popular square-shaped Asscher cuts is between 1.00 and 1.05.
There can be a variation in the width of the cut corners. The Asscher cut allows for tremendous luster and creates a fascinating optical illusion known as the “Hall of Mirrors” effect, due to its deep pavilion, faceted culet, high crown and small table.
The Asscher cut can also be referred to as a Square Emerald cut on a GIA or AGS laboratory certificate. Many people debate the differences between an Asscher cut and a Square Emerald cut, but you should know that they are in fact the same thing. There is also a different and rarer Royal Asscher cut, which is a patented version of the original Asscher cut with wide cut corners and 74 facets, instead of the standard 58. The Royal Asscher cut is classified as an octagonal step cut by the GIA.
The Asscher cut is named after its creator Joseph Asscher, who was the owner of the Amsterdam-based diamond company of the same name. It was developed in the early 20th century at the beginning of the popular Art Deco movement. Joseph Asscher became famous several years later when he was commissioned by King Edward VII to cut the famous Cullinan diamond for the English crown jewels.
Queen Juliana of Holland granted the Asscher Diamond Company a royal title in 1980, in recognition of the role the Asscher family and company had occupied in the diamond industry for such a length of tiem. The Asscher cut was at its most popular in the late 1920s but remained somewhat rare for the remainder of the century, normally available in only antique shops and specialised Art Deco jewelers. At the beginning of the 21st century following considerable research and development, the Asscher cut was redesigned with new specifications and additional facets for a more brilliant shine, and has become more popular since.