These online computerized estimators predict performance for a diamond when proportions are plugged in. In 2001 Australian geologist Garry Holloway introduced the HCA which gained great popularity on the internet. The GIA cut estimator is based on a similar principal.
The GIA cut estimator uses a scale of 5 levels. The top grade, “Excellent,” overlaps several AGS grades. This wider range allows for configurations farther away from Tolkowsky’s and a broader range of taste. The other grades in GIA’s system are Very Good, Good, Fair and Poor.
The Holloway Cut Advisor is a discriminating tool and will identify those diamonds predicted to be highly beautiful (the top 5% of known performers). It is a useful tool for rejection, but should not be used to select one good diamond over another. The best use of HCA is a final check on your selection to ensure it is a good performer.
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