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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

LabProfessional Gem Sciences (P.G.S.)
Cut >Excellent Ideal cutPremium Cut
Table width %53 - 5752 - 61
Crown Height %14.0 - 16.513.0 - 17.0
Crown Angle %33.5 - 35.532.5 - 36.5
Pavilion Depth %42.5 - 44.042.0 - 44.5
Pavilion Angle40.5 - 41.040.25 - 41.5
Girdle ThicknessThin to Sl. ThickVery Thin to Thick
Total Depth%Not AddressedNot Addressed
Culet size %Pointed to Medium: Sl. AbradedPointed to Medium: Sl. Abraded: Sl. Nicked