Oval diamonds are not graded by the gia for cut quality.
Oval diamond table and depth.
Similar to other fancy diamond shapes preferences of an oval cut diamond also vary by length to width ratios of the cut.
In order to end up with a beautiful oval diamond engagement ring it is important to make sure your jeweler understands optimum oval cut specifications.
For example see this excellent emerald cut diamond with a 64 6 depth.
The elongated design makes it appear larger than other shapes of the same carat weight.
Brighter blue indicates more diamonds having that specific depth and table combination.
For example this beautiful 1 01 carat oval cut diamond has a depth of 65 8.
62 to 66 polish symmetry.
Below is a heatmap showing the counts of all depth and table combinations for oval diamonds available online at james allen and blue nile.
Bursting with brilliance and fire an oval cut diamond is exquisite and unique.
For an asscher or emerald cut diamond an ideal depth is between 61 to 68 percent.
Based on the heatmap diamond cutters seem to prefer a depth range of 60 64 and a table range of 56 62.
To recap here are my recommended guidelines for buying an oval cut diamond.
Optimum table depth for oval diamonds.
For example an oval cut like this 1 01 carat diamond looks quite large in its yellow gold halo setting a 1 carat round diamond in a similar setting would look.
The oval is considered a fancy shape.
A shorter one carat oval shape diamond with a length of 5 millimeters and a width of 4 6 millimeter with an equal depth percentage of 65 would have a deeper total depth of 2 9 millimeters.
Very good or excellent length to width ratio.
Oval shape diamonds of shorter length and greater width display a smaller bow tie affect due to resulting steeper pavilion angles.
The accredited gem appraisers aga published ideal cut specifications for oval brilliant cut diamonds back in the 1980s.
For an oval cut diamond an ideal depth is less than 68 percent.
Diamond table and depth affect a diamond s overall cut grade.
Of all a diamond s 4 cs cut is the most complex and technically difficult to analyze.
In a grading report there are normally two measurements of depth the first is the actual depth measurement in millimeters shown under measurements at the top of a grading report and the second is the depth percentage see image above which shows how deep the diamond is in relation to.
54 to 58 depth.
The oval cut diamond.
Table depth proportions of a diamond refer to the diagram of a diamond above to see where a diamond s table depth crown height and girdle thickness are measured.
Summary recap and the best places to buy an oval diamond ring.
The depth of a diamond is its height in millimeters measured from the culet to the table.
G or better clarity.
