The ideal diamond proportion depends on the diamond shape you choose.
Best diamond depth and table.
But when a diamond proportion is perfectly balanced the diamond is able to take in maximum light and reflect it back beautifully.
Even then there is no definitive ideal proportion for every shape.
For round cut diamonds i always look for a table between 54 to 57 and a depth between 61 and 62 5.
An ideal appearance and maximum yield.
For example the ideal table for round cut diamonds is between 54 60 percent while the ideal dimensions for emerald cut diamonds puts table percentage between 66 72 percent.
You will notice two measurements of the depth on your diamond grading report.
For a marquise diamond an ideal depth range is between 58 and 62 percent of the total width of the diamond while a very good cut will have a depth range of 56 to 57 9 or 62 1 to 66 percent.
This happens because when diamond has a very high depth percentage most probably it will be too deep on the contrary very low depth makes the diamond shallow.
Table percentage is calculated by dividing the width of the table by the overall width of the diamond.
Basically any diamond with a score below 2 is worth considering and any diamond with a score above 2 should be discarded.
Depth of the diamond divided by the overall width of the diamond.
Here s a 1 21 carat marquise cut with a excellent depth at 59 7.
Most online vendors allow you to filter for the table and depth percentages in their advanced options.
Under 56 or over 64.
However the ideal depth is between 62 9 and 59 5 percent.
The ideal table percentage will vary based on the shape of your diamond.
When polishing a rough diamond cutters must find a balance between an optimal cut i e.
The table of your stone is the large flat facet on the top of your stone.
To find the depth percentage divide the diamond s physical depth measurement by its width.
Using the recommended table and depth percentages above you can easily rule out diamonds that aren t well cut.
Besides table and depth proportions i also follow a list of ideal proportions in crown and pavilion angles here.
What is diamond depth.
So whenever you choose a diamond try to make sure that it is within my suggested proportions.
Larger tables show more white sparkle or brilliance and smaller tables show more colored sparkle or fire.
One will record the actual depth measurement in millimetres the other is the depth percentage which notes how deep the diamond is in relation to its width.
