Research & Insights
New Industry Standard
We identify three primary visual characteristics of fancy color diamonds: Inner-Grade, Color Dispersion, and Undertone (IDU). We use grades 1, 2, 3, and 4. Grade 1 being the lowest quality grade and Grade 4+ is the highest possible grade, granted in rare cases and denotes stones with exceptional quality characteristics. Inner-Grade refers to the strength […]
Research & Insights
The FCRF I.D.U Grading Standard
A fancy color diamond is the most precious stone unearthed in the world. Its endless visual appearances make it the most complex gem to evaluate and price in the luxury space. Today, the vast majority of fancy color diamonds are submitted to the GIA lab to obtain a report confirming their natural origin and gemological […]
