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G.I.A. The Gemological Institute of America.
GIA is the industry standard for grading.
Certificates provide:

Shape Measurements
Weight
Depth Percentage
Table Percentage
Girdle Thickness
Culet Size
Polish
Symmetry
Clarity Grade
Color Grade
Fluorescence
Comments about Diamond
Plot of Internal and External Inclusions
GIA Grading Certificate

The A.G.S. gemological laboratory is equal to or more strict than G.I.A. AGS quality reports are most often used by diamond cutters who wish to confirm near ideal or ideal cut diamonds. The A.G.S. grading laboratory director is Peter Yantzer, past founding director of G.I.A.'s Gem Trade Laboratory. The A.G.S. was founded by Robert Shipley the founder of G.I.A. A.G.S.. Diamond Quality Reports provides this information:

Description Shape and Cut
Weight Measurements
Depth Percentage
Pavilion Depth Percentage
Table Percentage
Crown Angle
Crown Height Percentage
Pavilion Angle
Culet Size
Girdle Thickness
Polish/Symmetry
Clarity Grade
Color Grade
Cut Grade
Fluorescence
Comments about Diamond
Plot of Internal and External Inclusions

H.R.D. Certified Diamond Reports provide:HRD Grading Certificate

Shape and Cut
Measurements
Weight
Proportions
Girdle Percentage
Table Percentage
Crown Percentage
Pavilion Percentage
Girdle Thickness
Culet Size
Finish
Clarity Grade
Color Grade
Fluorescence
Comments about Diamond
Plot of Internal and External Inclusions

EGL Grading CertificateE.G.L. provides a detail diamond report. The E.G.L. certification does provide more proportion information than the G.I.A. diamond report by including the important pavilion and crown angles in their diamond report. Be aware that plots of internal and external blemishes on E.G.L. certifications are much less detailed than G.I.A. or A.G.S. quality reports. Many diamonds under one carat in size are certified by E.G.L. due to the benefit of lower cost and faster service. E.G.L. also provides a economically priced miniature version of its full certification. E.G.L. Certified Diamond Reports provide this information:

Shape and Cut Measurements
Weight
Depth Percentage
Table Percentage
Crown Angle
Pavilion Angle
Girdle Thickness
Culet Size
Polish
Symmetry
Clarity Grade
Color Grade
Fluorescence
Comments about Diamond
Plot of Internal and External Inclusions