8X® premium diamond cut grade. GCAL guaranteed standard Certs. Cut Grades on all diamond shapes. Diamond Journey Traceability. AI color & AI clarity grading. GCAL provides the most accurate & consistent grading, with uncompromising integrity. GCAL remains the only gem lab in the world to stand behind their grading with a zero tolerance, money-backed consumer guarantee. Guaranteed certificates include Gemprint® fingerprint image, Light Performance and Photomicrography (actual photos of diamonds -