Girdle Thickness
Girdle diameter
Table diameter
Table ratio measurement
Table comparison method
Total height
Crown height
Estimation of crown height - Examination of pavilion facets
Estimation of crown angle - Estimation of the profile ...
GIRDLE THICKNESS:
The thickness or range of variation in the thickness of a diamond's girdle.
See also: Girdle Grading report, grading certificate Cut
Custom Jewelry ...
8 Different Girdle Thicknesses
There are 8 different Girdle Thicknesses and Grades that you'll see on a Diamond Certificate as in the image below.
They are.
Girdle Thickness: the average thickness of the gemstone's girdle, which is the junction between the crown and pavilion of the stone.
Girdle Thickness - The width of the outer edge, or periphery, of a fashioned diamond or other gemstone.
girdle thickness Judged between the upper and lower girdle facets since this is where the girdle is at its thinnest.
Girdle Thickness
It is the measurement describing the percentage of the diamond's average girdle diameter. The girdle thickness ranges as follows: extremely thin; thin; medium; slightly thick; thick; extremely thick.
Girdling ...
The most important factors experts look at are table size, crown angle (measured in degrees), girdle thickness, pavilion depth (as a percentage of the total depth) and total depth.
What's the best cut?
The girdle thickness is a primary indicator of how well a diamond is cut. A heavy girdle occurs when the cutter puts more emphasis on retaining weight. If a girdle is made to thin, it may cause the edges of a Diamond to chip relatively easily.
Girdle Thickness
Culet Size
Polish Grade
Symmetry Grade
Clarity Grade
Color Grade
Cut Grade: for round diamonds only
Fluorescence Grade
Laser Inscription: Notes the content of any inscription present on the girdle of the diamond.
A guideline for maximum girdle thickness is 3% of the stones diameter. In no case should the thickness of girdle be less than 0.05 mm.
The descriptions of girdle thickness range as follows: extremely thin; thin; medium; slightly thick; thick; extremely thick.
To properly judge the cut of a diamond, you must know the Table Diameter (%), the Crown Angle (in degrees), the Pavilion Depth (%), the Girdle Thickness (%), and the Culet Size...
Depth: 58% to 63% of diameter
Crown Angle: 34 to 35 degrees
Girdle Thickness: medium to slightly thick
Facets: 58 (57 if the culet is excluded)
Polish & Symmetry: very good to excellent ...
Proportion: Measurements that include depth percentage, table size, girdle thickness and ratio to determine what grade to give the cut of the diamond.
Relative dimensions and angles of a polished diamond and the relationships between them; these include table size, crown angle, crown height, girdle thickness, pavilion angle, pavilion depth, culet size, girdle outline, length-to-width ratio, ...
Theoretically perfect cutting proportions for (round brilliant cut) diamonds. Exact specifications vary. Many mathematical models ignore girdle thickness.
IGI, I.G.I., International Gem Laboratory ...
1. Table size
2. Crown height and angle (angle of the bezel facets with the girdle)
3. Pavilion depth and angle (angle of the pavilion facets with the girdle)
4. Girdle thickness
5. Culet size ...
Ideal, Ideal Cut Theoretically perfect cutting proportions for (round brilliant cut) diamonds. Exact specifications vary. Many mathematical models ignore girdle thickness.
For larger stones you need table, depth, crown angle, girdle thickness etc.)
Clarity (noting damage e.g. I1- chipped)
Color
Finish (polish/symmetry)
Fluorescence (not needed on melee)
Enhancements (laser drilling, fracture filling, etc) ...
The girdle can be rough (matt), faceted, polished or unpolished but a polished or faceted girdle doesn't improve a gemstone's grade. Most labs grade a girdle's thickness, not its appearance and the descriptions of girdle thickness range as follows: ...
 See also: Diamond, Thickness, Clarity, Girdle, Color
  
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