7ct Oval (16×11.6×6.5) vs 7ct Cushion (12×10.5×6)
Diamond size comparison
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| 7 ct Oval (16×11.6×6.5mm) | 7 ct Cushion (12×10.5×6mm) |
Cutting style
Modified brilliant
(modified) brilliant
Weight
7 ct
7 ct
Measurements
16×11.6×6.5 mm
12×10.5×6 mm
L/W ratio
1.38
1.14
Face-up size
Borderline
Adequate
This diamond is borderline SPREAD CUT!
This diamond LOOKS its weight!
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 7ct Oval (16×11.6×6.5mm) and 7ct Cushion (12×10.5×6mm) 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.
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 7ct Oval (16×11.6×6.5mm) and 7ct Cushion (12×10.5×6mm) 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.
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Ring width: 3.0 mm
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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.
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.
| 7ct Oval (16×11.6×6.5mm) | |
| 7ct Cushion (12×10.5×6mm) | |
| Difference: 38.79mm² (34%) |
7 carat Oval (16×11.6×6.5mm) has approx. 34% more face-up area than 7 carat Cushion (12×10.5×6mm).
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).
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).
7ct Oval (16×11.6×6.5mm)
7ct Cushion (12×10.5×6mm)
Min. clarity
SI or better
SI1 or better
Min. color (platinum setting)
I+
H+
Min. color (yellow gold setting)
J+
J+
Depth percentage
59 - 65%
59 - 70%
Table percentage
53 - 62%
56 - 70%
Length-to-width ratio
1.25 - 1.65
1.00 - 1.35
Min. polish/symmetry
Good or better
Good or better
Additional Info
7ct Oval (16×11.6×6.5mm)
7ct Cushion (12×10.5×6mm)
Face-up size
A bit large for 7 carat Oval
Normal for 7 carat Cushion
Facets
usually 58
usually 58
Length
16 mm
12 mm
Width
11.6 mm
10.5 mm
Depth
6.5 mm
6 mm
Gram weight
1.4 g (0.0494 ounces)
1.4 g (0.0494 ounces)
Points
700 pts
700 pts
Volume
397.73 mm³
397.73 mm³
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Depth percentage for 7 carat Oval (16×11.6×6.5mm)
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 56%, which is too shallow!.
(Recommended depth percentage for Ovals is between 59% and
65%)
Depth percentage for ovals is calculated with the following formula:
Depth percentage for ovals is calculated with the following formula:
Depth % = (total depth ÷ width) × 100
7 carat
Oval
(16×11.6×6.5mm) depth %:
Total depth: 6.5 mm
Width = 11.6 mm
Width = 11.6 mm
Depth % = (6.5 ÷ 11.6 ) × 100 = 56%
Depth percentage for 7 carat Cushion (12×10.5×6mm)
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 57.1%, 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 percentage for cushions is calculated with the following formula:
Depth % = (total depth ÷ width) × 100
7 carat
Cushion
(12×10.5×6mm) depth %:
Total depth: 6 mm
Width = 10.5 mm
Width = 10.5 mm
Depth % = (6 ÷ 10.5 ) × 100 = 57.1%
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.
Diamonds that fall out of recommended depth range are generally less desirable and usually best to be avoided.
Face-up size evaluation for 7 carat Oval (16×11.6×6.5mm)
The face-up size of this 7 carat Oval
(16×11.6×6.5mm) is slightly out of normal range for
7ct diamonds of this shape. Compared to 7
carat Oval reference diamond, this diamond seems a bit too large
when viewed from the top. This could be indicative of a spread cut, which is not a good sign.
A spread cut is a diamond that is cut to maximize spread. In this case, it would look larger than a well cut 7 carat Oval when viewed from the top, however, this is usually not a good thing. Spread cuts are typically too shallow, which allows light to leak out of the stone instead of being properly returned back to the viewer's eye.
Spread cuts can 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.
A spread cut is a diamond that is cut to maximize spread. In this case, it would look larger than a well cut 7 carat Oval when viewed from the top, however, this is usually not a good thing. Spread cuts are typically too shallow, which allows light to leak out of the stone instead of being properly returned back to the viewer's eye.
Spread cuts can 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:
This diamond could be a spread cut. Caution is advised, since spread cuts
usually lack the sparkle and perfection that is expected of a beautiful diamond.
7 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.
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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 size evaluation for 7 carat Cushion (12×10.5×6mm)
The face-up size of this 7 carat Cushion
(12×10.5×6mm) is within the normal range for
7ct diamonds of this shape.
Compared to 7ct
Cushion reference diamond (see below), this diamond is of adequate
size when viewed from the top. In short, all is OK, this diamond looks its weight.
Proper face-up size should play an important role when buying a diamond. When a diamond is set in a ring, your eyes will only see the face-up area, so you should make sure it's of adequate size. Adequate size also indicates a good cut, meaning better light performance. For example, if given a choice between a poorly cut 7 carat Cushion with less sparkle and the same face-up size as a well cut 6.7ct Cushion, which one would you choose?
The importance of face-up size
Diamonds are sold by weight (carats), but it's important to understand that weight doesn't equally translate into physical size, especially spread. Two diamonds of the same carat weight can vary greatly in spread, meaning that one diamond can appear larger than the other, even though they weight exactly the same.Proper face-up size should play an important role when buying a diamond. When a diamond is set in a ring, your eyes will only see the face-up area, so you should make sure it's of adequate size. Adequate size also indicates a good cut, meaning better light performance. For example, if given a choice between a poorly cut 7 carat Cushion with less sparkle and the same face-up size as a well cut 6.7ct Cushion, which one would you choose?
The bottom line:
A diamond must look its weight. This one does. Thumbs up.
7 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.
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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 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 7ct Oval (16×11.6×6.5mm):
Top surface area = 152.19 mm²
Weight = 7ct
Face-up area per carat = 152.19 ÷ 7 = 21.74mm²/ct
Weight = 7ct
Face-up area per carat = 152.19 ÷ 7 = 21.74mm²/ct
Face-up area per carat
for 7ct Cushion (12×10.5×6mm):
Top surface area = 113.4 mm²
Weight = 7ct
Face-up area per carat = 113.4 ÷ 7 = 16.2mm²/ct
Weight = 7ct
Face-up area per carat = 113.4 ÷ 7 = 16.2mm²/ct
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