Diamond Gemology

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Diamonds Aids and Instruments for Cut-Grading Aids to Clarity Grading Artificial Color Changes in Diamonds and their Method of Identification Comparison Brilliants as the Basis of Color-Grading Brilliance CIBJO CIBJO Color Clarity Grading Clarity Color-Grader Color Grades: Origin and Nomenclatures Color Grading Color-Measuring Instruments Color Colorscope Color Grading Color-Measuring Instruments Comparing diamonds of different size Comparing diamonds of different hue Comparison table of different Color grading systems Conditions of Clarity Grading Crown height Cut Grading of Fancy Cuts Cut-grading of small brilliants Cut Damage Damaged Diamonds Definition of Clarity Grades Definitions of Clarity Grades according to Internal Defects in Accordance with the IDC Deviation from circular shape Diamond Sellers Diamond Lite Diamond Photometer Diamond Imitations Diascope Diamond Stereo Zoom microscope Differentiating between surface features and inclusions Dispersive brilliance Distinguishing features Eccentric culet Edge displacement of crown and pavilion facets Estimation of crown angle Estimation of crown height External Features External brilliance Extra facets Filled Diamonds Fluorescent diamonds Forms of cut of diamonds Formula for Calculating the Weight Further fancy cuts of diamond Gemmological Institute of America (GIA) Gemolite Girdle Thickness Girdle Growth lines International Diamond Council (IDC) IDC cut Home Illustrations P1 Illustrations P2 Illustrations P3 Illustrations SI Illustrations VS Illustrative Section Indentations, damage to edges, scratches Instructions for Practical Clarity Grading Instruments for Color-Grading Instruments for the Approximate Estimation of Weights of Brilliants Internal brilliance Introduction to Practical Color-Grading Irradiated diamonds Laser-drilled diamonds Listing of Structural Defects in Accordance with IDC Rule Listing of the External Defects in Clarity Grades in Accordance with IDC Rules Magno-Colorscope Means of Identification Microphotography Models of Microscopes Modernising Old Cut Natural crystal faces New Diamond Cuts Nicks and fractures Origin of clarity grades and determination of nomenclature Pavilion depth Polishing marks Potteratmaster Practical Cut-Grading Reflected inclusions Regularity of the facets Remission Spectrophotometer Representation of internal and external features in the identity diagram Scan.D.N. Scan D.N. Clarity Scan D.N. Cut Scanning microscope Scintillation brilliance Sideways reflection to estimate pavilion depth Size of the culet Size of the facets Sortoscope Summary of instructions on practical Color grading Summary table brilliant cut Summary table Symmetry Features Symmetry of table and table edges Symmetry of the girdle Table comparison method Table diameter Table of Values Color - Clarity Table ratio measurement Table reflection to estimate pavilion depth Tabular summary of diamond imitations with distinguishing features The DZ 9 M diamond microscope The KSW 63 diamond microscope The technique of microscopy Tilted table / eccentric table Total height Twinning lines Types of Brilliant Cut Varying Color impression Weighing Weight Tables Weight