Podcast
Questions and Answers
What is the Average Girdle Diameter of a diamond?
What is the Average Girdle Diameter of a diamond?
- The angle formed by the bezel facets and the girdle plane.
- The sum of the smallest and largest diameter measurements divided by two. (correct)
- The width of a diamond's girdle measured in millimeters.
- The result of dividing the smallest diameter measurement by the largest diameter measurement.
What does the Crown Height Percentage represent?
What does the Crown Height Percentage represent?
- The thickness of the girdle in relation to the overall size of the diamond.
- The distance from the girdle plane to the table expressed as a percentage of average girdle diameter. (correct)
- The total depth of a diamond measured from the table to the culet.
- The size of the table facet expressed as a percentage of the diamond's depth.
What common issue can arise from severe painting and digging out during diamond cutting?
What common issue can arise from severe painting and digging out during diamond cutting?
- It enhances the diamond's clarity characteristics.
- It increases the weight of the diamond significantly.
- It results in a more pronounced crown angle.
- It can cause uneven scalloping around the girdle and hill positions of differing thicknesses (correct)
Which of the following best describes Table Percentage?
Which of the following best describes Table Percentage?
What is the effect of a shallow crown on diamond cutting?
What is the effect of a shallow crown on diamond cutting?
What is the primary purpose of the Table Gauge in diamond measurement?
What is the primary purpose of the Table Gauge in diamond measurement?
Which of the following is a potential consequence of excessive digging out or painting in a diamond?
Which of the following is a potential consequence of excessive digging out or painting in a diamond?
What is the purpose of measuring a diamond’s table size in four directions?
What is the purpose of measuring a diamond’s table size in four directions?
What should be a consideration when evaluating the girdle thickness of a diamond?
What should be a consideration when evaluating the girdle thickness of a diamond?
What does Star Length Percentage indicate?
What does Star Length Percentage indicate?
The angle formed by the bezel facets and the girdle plane .....
The angle formed by the bezel facets and the girdle plane .....
Diamonds are always measured in .........
Diamonds are always measured in .........
Table-to-culet depth, expressed as a percentage of average girdle diameter is defined as the ......
Table-to-culet depth, expressed as a percentage of average girdle diameter is defined as the ......
The width of a fashioned gem’s girdle is .....
The width of a fashioned gem’s girdle is .....
Cutting technique that thins the area of the girdle where the upper half facet junctions meet the lower half facet junctions, to retain weight or remove clarity characteristics.
Cutting technique that thins the area of the girdle where the upper half facet junctions meet the lower half facet junctions, to retain weight or remove clarity characteristics.
Cutting technique that thins the area of the girdle where the bezel and pavilion main meet, to retain weight or remove clarity characteristics.
Cutting technique that thins the area of the girdle where the bezel and pavilion main meet, to retain weight or remove clarity characteristics.
What is the basis for comparing a diamond’s other proportions?
What is the basis for comparing a diamond’s other proportions?
Table size estimation techniques can be.......
Table size estimation techniques can be.......
Most round brilliants have table percentages that range from......
Most round brilliants have table percentages that range from......
Flashcards
Average Girdle Diameter
Average Girdle Diameter
The average of the smallest and largest girdle diameter measurements of a round brilliant diamond.
Crown Angle
Crown Angle
The angle between bezel facets and the girdle plane.
Crown Height Percentage
Crown Height Percentage
Distance from girdle to table, expressed as a percentage of average girdle diameter.
Digging Out
Digging Out
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Girdle Thickness
Girdle Thickness
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Painting
Painting
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Table Gauge
Table Gauge
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Table Percentage
Table Percentage
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Total Depth Percentage
Total Depth Percentage
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Table Size Estimation
Table Size Estimation
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Study Notes
DDG Ass #12 Key Terms
- Average Girdle Diameter: Result of adding smallest and largest diameter measurements, then dividing by two.
- Crown Angle: Angle between bezel facets and girdle plane.
- Crown Height Percentage: Distance from girdle to table, expressed as a percentage of average girdle diameter.
- Digging Out: Cutting technique thinning girdle area where upper and lower half facet junctions meet; used to retain weight or remove clarity.
- Girdle Thickness: Width of a fashioned gem's girdle.
- Painting: Cutting technique thinning girdle area where bezel and pavilion meet; used to retain weight or remove clarity.
- Star Length Percentage: Length of star facets, expressed as a percentage of the total distance from girdle to table edge.
- Table Gauge: Transparent measuring device used to measure diamond table in millimeters and tenths.
- Table Percentage: Diamond's table size, expressed as a percentage of average girdle diameter.
- Total Depth Percentage: Table-to-culet depth, expressed as a percentage of average girdle diameter.
Key Concepts
- Average Girdle Diameter: Basis for comparing diamond proportions.
- Diamond Table Percentage: Most round brilliants range from 55% to 65%
- Diamond Measurement: Diamonds are measured in millimeters.
- Table Size Determination: Measure table facet in four directions; average measurements to determine table size.
- Table Estimation Techniques: Techniques can be quick and fairly accurate with practice.
- Shallow Crown: Can help save weight from rough, but may negatively affect appearance.
- Girdle Thickness: Should be thick enough to prevent chipping, but not so thick it detracts from appearance.
- Painting & Digging Out: Severe painting/digging out results in uneven thickness/scalloping around the girdle, creating unattractive scintillation patterns, or making the diamond appear darker.
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Description
Test your knowledge of essential gemology terms with this quiz. You'll encounter key concepts related to diamond cutting, measurements, and techniques. Perfect for students and professionals in the field of gemology.
