RUSSIAN DIAMOND GRADING SYSTEM.

This section outlines the technical requirements of the TU 25.07.1319-77 grading system, which are used in diamond manufacturing. Since no special directions for diamond grading are adopted in Russia, TU requirements are applied. Strictly speaking, diamonds not corresponding to the TU 25.07.1319-77 standards cannot be graded within the Russian system..


Grading of round diamonds according to TU N 25-07.1319-77
Russian grading system for fancy-cut diamonds (TU 25-07.1319-77)