6.8ct Cushion (12×12×7) vs 6ct Oval (14×9.3×7)

Diamond size comparison

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Actual size of 6.8ct Cushion diamond
Actual size
sample image
vs.
Actual size of 6ct Oval diamond
Actual size
sample image
6.8 ct Cushion (12×12×7mm) 6 ct Oval (14×9.3×7mm)
Cutting style
(modified) brilliant
Modified brilliant
Weight
6.8 ct
6 ct
Measurements
12×12×7 mm
14×9.3×7 mm
Total depth
58.3% too shallow!
75.3% too deep!
L/W ratio
1
1.51
Face-up size
Inadequate
Borderline
 
This diamond is a SPREAD CUT!
This diamond BARELY looks its weight!
Actual diamond size
Actual diamond size
Before purchasing a diamond, one should make sure it looks its weight. It's important to understand that carat weight does not equal face-up size.

Two diamonds of exactly the same weight (and shape) can vary quite considerably in face-up size. This depends on the proportions of the cut (e.g., deep cuts will face up smaller).

Here you can see the actual sizes of 6.8ct Cushion (12×12×7mm) and 6ct Oval (14×9.3×7mm) as they would appear on a ring and finger.

Adjust the ring and finger size to get an idea of how these stones would look on your finger. To choose different diamonds or to change diamond parameters click here.
Settings
Ring: Skin tone:
Ring width: 3.0 mm
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Left finger image
Ring on a left finger
6.8ct Cushion on a left ring
64 mm
Right finger image
Ring on a right finger
6ct Oval on a right ring
Your settings
Ring
Gold
Skin tone
Light
Ring diameter
16.9 mm
Ring width
3.0 mm
Finger length
64 mm
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Ring diameter: 16.9 mm
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6.8ct Cushion side view Side view of ring
vs
6ct Oval side view Side view of ring
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Face-up area
129.6 mm²  (±5%)
106.76 mm²  (±5%)
Face-up area is a measure of the size of the diamond when viewed from the top (as set in a ring).

It tells you how big the diamond is at the girdle plane. It's important for a diamond to have sufficient face-up size for its carat weight.
Face-up size outline
Face-up size outline
6.8ct Cushion (12×12×7mm)
6ct Oval (14×9.3×7mm)
Difference: 22.84mm² (21%)
6.8 carat Cushion (12×12×7mm) has approx. 21% more face-up area than 6 carat Oval (14×9.3×7mm).
Face-up area per carat
19.06 mm²/ct
17.79 mm²/ct
To learn about the accuracy of these numbers, click here.


Quick Buying Guide

Diamond prices vary greatly as they depend on the combination of unique characteristics (4Cs - Cut, Color, Clarity, and Carat). For best value, it's important to choose the combination that will reduce the price without having a negative impact on appearance.

Each shape has its own recommended balance of qualities that will give you the most bang for your buck. Below is a quick buying guide to give you an idea, but for more detailed explanation, please see the complete buying guides for the respective diamonds (links below).
6.8ct Cushion (12×12×7mm)
6ct Oval (14×9.3×7mm)
Price (best value)
Min. clarity
SI1 or better
SI or better
Min. color (platinum setting)
H+
I+
Min. color (yellow gold setting)
J+
J+
Depth percentage
59 - 70%
59 - 65%
Table percentage
56 - 70%
53 - 62%
Length-to-width ratio
1.00 - 1.35
1.25 - 1.65
Min. polish/symmetry
Good or better
Good or better
 Detailed buying guide

Additional Info

6.8ct Cushion (12×12×7mm)
6ct Oval (14×9.3×7mm)
Face-up size
Too large for 6.8 carat Cushion
A bit small for 6 carat Oval
Facets
usually 58
usually 58
Length
12 mm
14 mm
Width
12 mm
9.3 mm
Depth
7 mm
7 mm
Gram weight
1.36 g (0.048 ounces)
1.2 g (0.0423 ounces)
Points
680 pts
600 pts
Volume
386.36 mm³
340.91 mm³


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Depth percentage for 6.8 carat Cushion (12×12×7mm)

Depth percentage of Cushion cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 58.3%, which is too shallow!. (Recommended depth percentage for Cushions is between 59% and 70%)

Depth percentage for cushions is calculated with the following formula:
Depth % = (total depth ÷ width) × 100

6.8 carat Cushion (12×12×7mm) depth %:
Total depth: 7 mm
Width = 12 mm
Depth % = (7 ÷ 12 ) × 100 = 58.3%

Depth percentage for 6 carat Oval (14×9.3×7mm)

Depth percentage of Oval cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 75.3%, which is too deep!. (Recommended depth percentage for Ovals is between 59% and 65%)

Depth percentage for ovals is calculated with the following formula:
Depth % = (total depth ÷ width) × 100

6 carat Oval (14×9.3×7mm) depth %:
Total depth: 7 mm
Width = 9.3 mm
Depth % = (7 ÷ 9.3 ) × 100 = 75.3%

About Depth Percentage
Depth percentage is one of the most important measurements as it plays a critical role in diamond's appearance. If a diamond is cut too deep or too shallow, light leaks out, making the stone less brilliant and fiery. Deep cuts also add hidden weight.

Diamonds that fall out of recommended depth range are generally less desirable and usually best to be avoided.


Face-up size evaluation for 6.8 carat Cushion (12×12×7mm)

The face-up size of this 6.8 carat Cushion (12×12×7mm) is out of normal range for 6.8ct diamonds of this shape. Compared to 6.8 carat Cushion reference diamond, this diamond appears too big when viewed from the top. You might think that's a good thing, however, it's not. This is a so called spread cut.

A spread cut is a diamond that is cut to maximize spread instead of optimal light performance. If compared from above, it would look larger than a well cut 6.8ct Cushion. This is not a good thing. Spread cuts are typically too shallow, which allows light to leak out of the stone resulting in less light being reflected back to the viewer's eye.

Spread cuts usually look lifeless and flat, and can sometimes exhibit a fish-eye effect. They may also come with an extremely thin girdle which can easily chip.

The bottom line: Spread cuts generally lack the brilliance and perfection that is expected of a beautiful diamond. Don't be fooled into thinking that you're getting a larger diamond for the money. This could be a rather flat, boring stone.

6.8 carat Cushion reference diamond
Since there are no specific ideal proportions defined for Cushion cuts, an estimation formula is used to calculate the Cushion reference diamond.
Parameters:
Weight: 6.8ct
Depth: 64%
L/W ratio: 1
 
Calculated values:
Length: 11.04 mm
Width: 11.04 mm
Depth: 7.07 mm
*Est. face-up area: 109.69 mm²
Note: Cushion diamonds with face-up area of within 9% lower and 12% higher than reference Cushion diamond area are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Cushion cuts is only an estimation (±5%). Due to uniqueness of each stone, it's impossible to accurately calculate face-up area given only a diamond's measurements.
To learn more about diamond size evaluation, click here.


Face-up size evaluation for 6 carat Oval (14×9.3×7mm)

The face-up size of this 6 carat Oval (14×9.3×7mm) is slightly out of normal range for 6ct diamonds of this shape. Compared to 6 carat Oval reference diamond, this diamond appears a bit too small when viewed from the top, which means it's probably a borderline chubby.

A chubby is a diamond with hidden extra weight that looks smaller than it should when viewed from the top. Hidden weight is typically a result of a poor cut usually linked to oversized girdle, deeper pavilion, and/or steeper crown.

In order to maximize profits, diamond cutters tend to retain as much weight from the rough as possible. This practice, however, can have detrimental effects on the stone's face-up size and its optical qualities. Poorly proportioned stones look duller and sparkle less than well cut stones. Chubby stones also look smaller.

The bottom line: One should never sacrifice beauty for weight. You probably don't want to pay for extra weight that doesn't add anything to the beauty. You want a stone that looks its weight. Sizewise, this 6ct Oval looks like a well cut 5.11ct Oval.

6 carat Oval reference diamond
Since there are no specific ideal proportions defined for Oval cuts, an estimation formula is used to calculate the Oval reference diamond.
Parameters:
Weight: 6ct
Depth: 61%
L/W ratio: 1.5
 
Calculated values:
Length: 14.75 mm
Width: 9.83 mm
Depth: 6 mm
*Est. face-up area: 118.89 mm²
Note: Oval diamonds with face-up area of within 9% lower and 12% higher than reference Oval diamond area are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Oval cuts is only an estimation (±5%). Due to uniqueness of each stone, it's impossible to accurately calculate face-up area given only a diamond's measurements.
To learn more about diamond size evaluation, click here.


Face-up Area per Carat

Face-up area per carat is calculated by dividing face-up area of the diamond with its carat weight. It tells you how many square millimeters of the top surface area a diamond is showing or would show for 1 carat weight. This can be useful when comparing stones of similar weights as it tells you how much spread per carat you will get.

Note: Face-up size does not linearly grow with carat weight, which means the heavier the stone, the smaller its face-up area per carat (e.g., 1ct stone will have higher face-up area per carat than 2ct stone).

Face-up area per carat for 6.8ct Cushion (12×12×7mm):
Top surface area = 129.6 mm²
Weight = 6.8ct

Face-up area per carat = 129.6 ÷ 6.8 = 19.06mm²/ct

Face-up area per carat for 6ct Oval (14×9.3×7mm):
Top surface area = 106.76 mm²
Weight = 6ct

Face-up area per carat = 106.76 ÷ 6 = 17.79mm²/ct

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