PRECISION GEM GRADING LABORATORY

Diamond Grading Services for Consumers and Trade.
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Diamond Grading Certificate with Light Behavior

PGGL's Diamond Grading Certificate is created using ImaGem’s direct measurement technology and brings to the trade and consumers a new level of accuracy and precision to diamond grading. PGGL guarantees the grades and measures provided in this Diamond Grading Cert.

 

The Cert includes information on the 4Cs, gauging, fluorescence, light behavior, symmetry, craftsmanship grade, alignment, polish and much more. Clarity plots can be added for an extra cost. 

  • Direct measurement technology ensures the data on the Report is measured from the actual stone – and not estimated from a model
  •  
    Patented ImaGem technology offers face up view of table and side view of profile showing how well a diamond has been crafted
  • We guarantee the results on our Certificates!
  • Unprecedented accuracy and repeatability
  • Costs less than 1/3rd of Certificates from other labs
  • Flexibility to include plots and/or light behavior information
  • Guaranteed 48 hour turnaround                                                             

                                                

click here to view a larger image of the report

 

Performance Specifications
Gauging: ± 0.005mm with 2 Sigma probability for linear measurements for all sizes except for table. Repeatability for angles depends on size of stone.
Color: ±1/3rd grade with 2 Sigma probability.
Fluorescence:  ± 0.03 with 2 Sigma probability on C.I.E. (Commission Internationale L' Eclairage, France) XYZ scale.
Light Behavior: ±2% of Brilliance; ±2% of Sparkle; ±4% of Intensity – all with 2 sigma probability.