GIA G230 Study Materials
Reference materials for appraisal study and practice
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Advanced Diamond Plotting Standards
Diamonds
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Cut Proportions & Weight Estimation Cheat Sheet
Diamonds
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Masterstone Color & Grading Protocol
Diamonds
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Rough Diamond Sorting Guide
Diamonds
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Synthetic Diamonds, Simulants & Treatments
Diamonds
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The 2 Stone Practical Worksheet Workflow
Diamonds
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The Clarity Plotting Legend and Rules Guide
Diamonds
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Total Depth Percentage
Average diameter and depth percentage from micrometer readings
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Table Percentage
Top-down table-to-girdle proportion calculations
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Star Length Percentage
Visual estimation and rounding of star facet length
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Crown Angle
Bezel facet angle estimation rounded to the nearest 0.5°
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Girdle Thickness
Minimum and maximum valley thickness grades
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Bearded Girdle
Inclusion
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Bruise
Inclusion
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Bruise
Inclusion
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Cavity
Inclusion
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Cavity in G Color I1 diamond
Inclusion
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Chip
Inclusion
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Chips on Girdle and Culet
Inclusion
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Clearly visible twinning wisps without magnification
Inclusion
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Cloud
Inclusion
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Crystal
Inclusion
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Dark-appearing cloud inclusion in an SI2 diamond
Inclusion
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Etch Channel
Inclusion
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Feather
Inclusion
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Feather Inclusion Reaching Girdle Surface
Inclusion
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Feather plotted on both sides
Inclusion
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G Color SI2 diamond plot
Inclusion
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G Color VS1
Inclusion
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G SI1 diamond with Feather
Inclusion
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Grain Center
Inclusion
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H Color SI2 diamond plot
Inclusion
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Hazy cloud inclusion dulling the center of a diamond
Inclusion
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Indented Natural
Inclusion
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Indented Natural on Pear Cut
Inclusion
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Internal Graining
Inclusion
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Internal Laser Drilling
Inclusion
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Knot
Inclusion
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Knot reaching surface
Inclusion
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Laser Drill Holes
Inclusion
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Laser Drill-hole
Inclusion
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Moderately visible twinning wisps under magnification
Inclusion
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Needle
Inclusion
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Pinpoint
Inclusion
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Plot of Feather in H Color SI2 diamond
Inclusion
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Rare Diamond with Prominent Etch Channels – A Collector’s Delight
Inclusion
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Sample Plot with various
Inclusion
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Side by Side View of Natural vs Indented Natural
Inclusion
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Surface Reaching Feather
Inclusion
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Twinning Wisp
Inclusion
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visible needle inclusion near the table
Inclusion
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Clear vs Cloudy Diamond
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Clear vs Cloudy Diamond 2
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Diamond Color Scale
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Diamond Cuts
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Diamond Education
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Diamond Inclusion Comparison
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Diamond Inclusion Types
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Diamond Inclusions - Rarity and Risk
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GIA Anatomy of a Diamond
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GIA Clarity Grading Scale
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GIA Clarity Reporting
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GIA Clarity Scale
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GIA Color and Clarity
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GIA Color Chart
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GIA Plotting Symbols Key
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GIA Sample Diamond Plot Report
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GIA Understanding 4 C's
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Multiple Diamond Flaws Cross Section
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Natural vs Lab Diamond Rough
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Official GIA Diamond Grading Chart
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Understanding the 4 C's
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