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PGS_logoProfessional Gem Sciences (PGS) is a full service gemological laboratory, offering independent, quality reports on diamonds and colored gemstones, whether loose or mounted in jewelry, for both the trade and private individuals.

PGS Cut Grade Parameters

Lab Professional Gem Sciences (P.G.S.)
Cut > Excellent Ideal cut Premium Cut
Table width % 53 - 57 52 - 61
Crown Height % 14.0 - 16.5 13.0 - 17.0
Crown Angle % 33.5 - 35.5 32.5 - 36.5
Pavilion Depth % 42.5 - 44.0 42.0 - 44.5
Pavilion Angle 40.5 - 41.0 40.25 - 41.5
Girdle Thickness Thin to Sl. Thick Very Thin to Thick
Total Depth% Not Addressed Not Addressed
Culet size % Pointed to Medium: Sl. Abraded Pointed to Medium: Sl. Abraded: Sl. Nicked