The International Gemological Institute (IGI) has launched a new feature for its diamond grading reports powered by the Ideal-Scope, a scientific light performance assessment tool.
The overall score is categorized as low, moderate, high, superior or exceptional to assess a stone's light performance, together with separate scores for brightness, fire, and contrast, which combine to produce scintillation.
“Light performance is directly connected to a diamond’s appeal,” said IGI’s CEO Tehmasp Printer.
“In recent years we have seen increasing interest in expanded performance analysis. IGI has responded by creating an easy to understand, science-based light performance report along with cutting guidelines for diamond producers, empowering them to target the best results. We are pleased to support manufacturers, sellers, and buyers of high performing diamonds with detailed information on these popular aspects of diamond beauty.”
The system was developed by IGI researchers using ray-tracing software and slope proportions logic to assess a wide range of parametric data sets for round-brilliant cuts spanning 18 table sizes. The lab notes that light performance analysis is based on external proportions and does not account for dense clarity characteristics of a diamond.
Theodor Lisovoy, Editor in Chief of the European bureau, Rough&Polished
