Diamond Gemology

• Home
• Diamond Color
  • Color Grades
    • RAL
    • GIA
    • CIBJO
    • IDC
    • ScanD.N
  • Color-Grading
  • Comparison
  • Introduction to Color-Grading
    • Varying Color impression
    • Comparing diamonds of different size
    • Comparing diamonds of different hue
    • Fluorescent diamonds
    • Summary of instructions on practical Color grading
  • Instruments
    • Day-light Lamps
    • Color-Grading Equipment - Colorscope
      • Magno-Colorscope
      • Color -Grader
      • Diamond Lite
    • Color-Measuring Instruments - Electronic Colorimeter
      • Remission Spectrophotometer
      • Diamond Photometer
  • Artificial Color
    • Irradiated diamonds
    • Distinguishing features
    • Summary table
  • What are Artificial Colors of Diamonds
  • Artificial Colors of Diamonds
  • Most Most Famous Color Diamonds
  • List of Famous Diamonds
  • Rare Color of Diamonds
  • Rarest Color of Diamonds
  • Popular Color of Diamonds
• Diamond Clarity
  • Origin
    • CIBJO
    • Scan.D.N.
    • GIA
    • IDC
  • Clarity Grading
    • Description of inclusions
    • Laser-drilled diamonds
    • Filled diamonds
  • Conditions
  • Definition
  • Illustrations
    • VVS
    • VS
    • SI
    • P1
    • P2
    • P3
  • Aids
  • Models of Microscopes
    • Gemolite
    • Diascope Diamond Stereo Zoom microscope
    • The DZ 9 M diamond microscope
    • The KSW 63 diamond microscope
    • Scanning microscope
    • Sortoscope
    • Potteratmaster
  • Instructions
    • The technique of louping
    • The technique of microscopy
    • Differentiating between surface features and inclusions
    • Reflected inclusions
    • Representation of internal and external features in the identity diagram
    • Symbols of representation of inclusions
    • Microphotography
• Diamond Cut
  • Theoretical Basis
  • Brilliance
    • External brilliance
    • Internal brilliance
    • Dispersive brilliance
    • Scintillation brilliance
  • Forms of cut
    • Simplified cut
    • Modified brilliant cut
    • Brilliant cuts - Types of Brilliant Cut
      • Tolkowsky
      • Ideal
      • Practical Fine Cut
      • Parker
      • Scan D.N
      • Eulitz
    • Summary table
  • Practical Cut Grading
    • Cut grading of small brilliants
  • Proportions
    • Girdle diameter
    • Table diameter
    • Table ratio measurement
    • Table comparison method
    • Total height
    • Crown height
    • Estimation of crown height
    • Estimation of crown angle
    • Girdle thickness
    • Pavilion depth
    • Sideways reflection to estimate pavilion depth
    • Table reflection to estimate pavilion depth
  • Symmetry Features
    • Deviation from circular shape
    • Tilted table / Eccentric table
    • Eccentric culet
    • Symmetry of table and table edges
    • Size of the facets
    • Regularity of the facets
    • Edge displacement of crown and pavilion facets
    • Size of the culet
    • Symmetry of the girdle
    • Table of Symmetry Features
  • External Features
    • Girdle
    • Natural crystal faces (naturals)
    • Extra facets
    • Twinning lines
    • Growth lines
    • Damage
    • Nicks and fractures
    • Indentations, damage to edges, scratches
    • Polishing marks
    • Knots
    • Burn marks
  • Cut Grading of Fancy Cuts
  • Further fancy cuts
  • New Diamond Cuts
  • Aids and Instruments for Cut Grading
• Diamond Carat
  • Unit of Weight
  • Weighing
  • Weight Tables
  • Formulas
  • Instruments for Estimation of Weights
  • Modernizing Old Cut
  • Damaged Diamonds
• Articles
  • Diamonds 4 C's
  • Diamond imitations
    • Means of Identification
  • Most expensive diamonds
  • How to clean Diamonds?
  • About Diamond Jewelry
  • Jewelry Designing
  • Gemology Institutes
  • Gemology Books
  • Necklaces
  • Gemstone Necklaces
  • Links
• Gemology
  • What is Gemology?
  • Precious and Semiprecious
  • The Main Factors For Durability
    • Hardness
    • Toughness
    • Stability
    • Specific Gravity
    • Table of Hardness, Specific Gravity, Refraction Index of Gemstones
    • The Significance of Durability
  • Optic's
  • Color of Gemstones
  • Star Gemstones
  • Physical Properties of Gemstones
  • The Crystallography and Forms of Gemstones
  • Types of Gemstone Deposits
  • Sources of Gemstones
  • Doublets, Coated Stones And Foilback
  • Identification By Double Refraction & Pleochroism
• Gemstones
  • Value of Gemstones
  • Classification of Gemstones
  • Naming Gemstones
  • Corundum, Rubies, Sapphire
  • Beryl,Emerald,Aquamarine
  • Chalcedony
  • Chrysoberyl
  • Turquoise
  • Lapis Lazuli
  • Amber
  • Coral
  • Ivory
  • Jet
  • Tortoise shell
  • Synthetic Gemstones