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Grading Lab Survey Introduction Method of Survey Results - Clarity and Color - Cut Grades - Clarity Plots - Laser Inscription - Girdle Thickness - Measurements - Pricing  - Price Differences Discussion - Brand Value - Appraisal Conclusion Acknowledgements Appendix I Appendix II Appendix III Appendix IV Appendix V Diamond Tutorial		Appendix III. Proportions and Measurements   No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Total Depth % GIA 63 59.8 60.6 62.2 61.9 61.9 61.5 61.5 60.9 61.8 63.0 62.8 61.5 60.4 61.2 56.9 63.0 AGS 63.2 60.1 60.8 62.6 61.8 61.8 61.4 61.2 60.8   63.0 63.4 61.6 60.8 61.4 57.3 63.4 EGL 63.1 60.4 60.7 62.4 62.3 62.1 61.8 61.9 61.1 62 63.3 63.3 61.8 60.8 61.5 57.4 63.5 Table % GIA 55 60 61 59 53 54 56 57 57 56/57 59 58 60 56 54 62 54 AGS 54 59 60 59 54 55 57 57 57   59 58 60 55 54 61 54 EGL 54 58 60 58 54 54 56 57 57 56 59 58 60 56 53 62 54 Girdle GIA Med – S.Thk F Med F Thn – Med F Thn – Med F Med F Thn – Med F Med F Thn – Med F Thn F Med – S.Thk F S.Thk F Thn - Thk F Med - S.Thk Thn Med Thn - Med F Med - Thk F AGS Med – Thk F Thn – S.Thk F Thn – S.Thk F V.Thn – Med F 0.9% - 2.0% F 0.7% - 1.5% F 1.5% - 2.2% 0.7% - 1.5% F 0.7% - 1.2% F   S.Thk F Thn - Thk F Med - Thk Thn Thn - Med Thn - Med F S.Thk - Thk, F EGL Med – S.Thk F Med F V.Thn – Thn V.Thn – Thn Thn F Thn F Thn – med F 0.7% - 1.3% Thn F Thn - Med F S.Thk F X.Thn - S.Thk F Med - S.Thk SF Thn Med - S.Thk Thn - Med F S.Thk - Thk F Diameter Min (mm) GIA 5.72 6.00 6.63 6.58 5.49 5.43 5.44 5.48 5.78 5.67 5.86 5.63 5.79 6.79 6.50 7.15 5.62 AGS 5.71 5.99 6.64 6.59 5.50 5.43 5.45 5.5 5.79   5.87 5.62 5.79 6.79 6.50 7.14 5.62 EGL 5.71 5.99 6.63 6.58 5.47 5.41 5.43 5.47 5.76 5.65 5.85 5.60 5.77 6.77 6.49 7.13 5.61 Diameter Max (mm) GIA 5.81 6.05 6.68 6.63 5.52 5.46 5.48 5.51 5.81 5.69 5.92 5.70 5.85 6.82 6.60 7.19 5.65 AGS 5.81 6.05 6.7 6.63 5.54 5.47 5.49 5.52 5.82   5.92 5.69 5.87 6.80 6.59 7.18 5.65 EGL 5.78 6.03 6.68 6.62 5.51 5.45 5.46 5.51 5.8 5.67 5.91 5.67 5.88 6.81 6.59 7.16 5.66 Total Depth (mm) GIA 3.63 3.6 4.03 4.11 3.41 3.37 3.36 3.38 3.53 3.51 3.71 3.56 3.58 4.11 4.01 4.08 3.55 AGS 3.61 3.62 4.05 4.14 3.41 3.37 3.36 3.37 3.53 3.71 3.58 3.59 4.13 4.02 4.10 3.57 EGL 3.63 3.63 4.04 4.12 3.42 3.37 3.37 3.39 3.54 3.51 3.72 3.57 3.59 4.12 4.02 4.10 3.57 Pavilion Angle AGS 40.8 41.4 41.3 41.1 40.9 40.8 41.1 41 41.8 41.2 41.5 40.9 41.1 41.1 40.9 EGL               41.2                   Pavilion Depth % AGS 42.9 43.7 44.3 43.6 43.3 43.1 43.0 43.4 43.2   44.3 43.4 43.9 43.2 43.4 43.4 43.2 EGL 42.8 44.3 44.3 43.5 43.5 43.3 43.1 43.8 43.5 42.8 44.6 43.4 44.1 43.2 43.6 43.7 43.2 Crown Angle AGS 35.4 32.3 33.2 34.5 34.0 34.4 34.3 34.2 34.1   35.9 37.2 34.3 34.9 33.7 29.7 34.7 EGL               34.4                   Crown Height % AGS 16.3 13   14.2 15.6 15.4 14.8 14.5 14.5   14.8 15.8 13.7 15.5 15.3 11.0 15.8 EGL 16.5 13.1 13.2 14.5 15.7 15.7 14.9 14.8 14.7 14.8 14.8 16.0 13.9 15.5 15.4 10.9 16.0 Culet GIA N N N N N N N N N N N N N N N N N AGS P P P P P P P P P   P P P P P P P EGL N N N N N N N N N N N N N N N N N Abbreviations Girdle X.Thn - Extremely Thin V.Thn - Very Thin Thn - Thin Med - Medium S.Thk - Slightly Thick Thk - Thick F - Faceted Culet N - None P - Pointed   discuss   « Appendix II   |   Appendix IV »

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