• Grades:Colorless - DEF, Near Colorless - GHIJ, Faint Yellow - KLM
  • Equipment:GIA tested master stones
  • The color determination is carried out under regulated laboratory conditions by our professionals. Our color categories are aligned with the widely accepted international classification system. Corvin Laboratory grades all colors using a double letter grade system, starting with the D-E grade. This double letter system is also suitable for grading smaller and multiple melee diamonds within a single certification.

    If the diamond falls between two color grades, it will be graded in the better category according to the international standard of procedures. For example, if the diamond is lower than E, but slightly better than F, the diamond will be graded as D-E.