Pavilion Depth Percentage
When a diamond crystal comes from the ground, the brilliance, fire, and scintillation that constitute the unique beauty of a polished diamond are still locked within it. The way in which a diamond cutter decides to the cut the diamond ultimately determines the diamonds beauty and brilliance.
The white table reflection appears larger as the pavilion depth percentage increases and smaller as pavilion depth percentage decreases.
- 38.0 = Girdle seen in table
- 39.0 = reflection broken up
- 40.0 = reflection broken up
- 41.0 = 1/8 size of table
- 42.0 = 1/4 size of table
- 43.0 = 1/3 size of table
- 43 = 1/2 size of table
- 45.0 = 5/8 size of table
- 46.0 = 2/3 size of table
- 47.0 = 7/8 size if table
- 49.0 = Dark table facets
- 50.0 = Dark star facets
Increasing the pavilion angle causes light to leak out the pavilion and makes the center of the stone noticeably darker. In diamonds with very deep pavilions, the darkness covers the entire table and extends out into the star facets, creating what many experts call a nail head. On the other hand, decreasing the pavilion angle by just two degrees often produces a fisheye with a gray girdle reflection visible through the table.
The pavilion depth percentage represents the actual height of a diamonds pavilion or the distance from the lowest point of the girdle's edge to the point of culet.
Pavilion depth percentage is calculated by dividing crown height by the diamond's average girdle diameter.
The pavilion depth percentage is a very important element of a diamond's proportions and is greatly responsible for the amount of brilliance that a diamond will display.
The pavilion depth percentage for round brilliant cut diamonds will be different for fancy shaped diamonds. To learn more about the proper pavilion depth percentage for fancy cut diamonds, call or visit Droste's and speak to one of our Certified Gemologist-Appraisers.
Diamonds which have ideal to very fine cut with proper pavilion angles provide the greatest brilliance. The facets on the bottom of a diamond are called pavilion facets. When you look at a round brilliant cut diamond face-up, the pavilion facets act as mirrors which reflect the image of the table, the large facet on the top of the diamond. This white table reflection seen within the center of the diamond provides the sparkle in the center of the diamond.
In a very fine to Ideal cut diamond the diamond will exhibit a white table reflection that appears in the center of the table. This reflection should be 1/4 to 1/2 the size of the large table facet on top of the diamond.
The AGS Ideal 0 Cut grade includes a narrow range of pavilion depth percentages from 42.2 degrees to 43.8 degrees.
Ideal to Very Fine Cut Diamonds have pavilion depth percentages between 41.7 Degrees and 44.8 Degrees. Diamonds within this range usually provide excellent brilliance. Diamonds that have depths outside these ranges usually cost less, but a degree of brilliance is lost. The diagram below illustrates how the white table reflection changes in size as the depth percentage changes.
Round Brilliant Cut Pavilion Depth Percentage:
Droste's Certified Gemologist-Appraisers carefully examine every diamond to ensure that crown height, crown angles, pavilion depth percentage and pavilion angles are within the ranges of ideal to very fine quality before it is shipped to you.
Droste's Gemological Laboratory is accredited by the American Gem Society (AGS) and is equipped with a Sarin proportion analyzer, the same non contact optical measuring device used by GIA to measure diamond proportions. (See diagram right) Certified-Plus Diamonds does not ship a diamond until cut quality is confirmed to be very fine or ideal cut and all elements of cut are discussed with you.
Droste's is unmatched in quality assurance and lower diamond prices. Don't take chances or waste time, select your diamond direct from knowledgeable experts you can trust. Droste's Certified Gemologist-Appraiser will be happy to answer any questions you may have in regards to selecting a properly cut diamond. Call or visit us today.