Asscher Cut Diamonds - Square Emerald Cut Diamonds
A Square Emerald or "Asscher" cut is a step cut with angled corners and rows of pavilion and crown facets that run parallel to the girdle. “Asscher” is a term often used in the marketplace to describe these square Emerald cuts. The term is derived from the Asscher family name. The Royal Asscher Diamond Company currently produces the “Royal Asscher” cut, which is a patented square step cut with an extra row of facets on top and bottom, a notable high crown, and 74 total facets. http://www.asscher.nl/ Optimal length to width ratio for Square Emerald cuts is .95 to 1.05.
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Special Characteristics of Asscher or Square Emerald Cut Diamonds
It is easier to see inclusions in step cuts vs. brilliant cuts. Optimally, a balanced and symmetrical stone with a table % that is smaller than the total depth % is recommended. There are a myriad of combinations that can make for beautiful stones, but guided parameters are now available.
Square Emerald cuts will generally look smaller from the “face up” position than other shapes of the same carat weight. This is a result of their different design and while depth is not strictly tied to spread (as it is with rounds) square emeralds may have greater total depth as a result of optimized angles for light return (good) or pavilion “bulge” (bad).
Basic Asscher Cut Guidelines courtesy of http://www.gemappraisers.com
International fine trade cut
US domestic average cut
Crown Height %
V. Thin to Sl. Thick
V.Thin to Thick(0.4%-5.5%)
Very Thin to Very Thick
Extremely thin to
Total Depth %
> Class 3 < Class 3
Courtesy of D.S. Atlas, Accredited Gem Appraisers, © AGA 1998-2004
Asscher Cut Diamonds posted on Pricescope
Threads with pictures of Asscher Cuts
Thread discussing Asscher Cuts
Intensive Asscher Cut Journal DiscussionPerformance and the p3 facets, a discussion about step cut diamonds.
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