4.66ct Cushion (10.67×10.34×5.88) vs 3.08ct Oval (11.28×8.38×5.14)
Diamond size comparison
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| 4.66 ct Cushion (10.67×10.34×5.88mm) | 3.08 ct Oval (11.28×8.38×5.14mm) |
Cutting style
(modified) brilliant
Modified brilliant
Weight
4.66 ct
3.08 ct
Measurements
10.67×10.34×5.88 mm
11.28×8.38×5.14 mm
L/W ratio
1.03
1.35
Face-up size
Inadequate
Adequate
This diamond is a 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 4.66ct Cushion (10.67×10.34×5.88mm) and 3.08ct Oval (11.28×8.38×5.14mm) 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 4.66ct Cushion (10.67×10.34×5.88mm) and 3.08ct Oval (11.28×8.38×5.14mm) 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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Skin tone:
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.
| 4.66ct Cushion (10.67×10.34×5.88mm) | |
| 3.08ct Oval (11.28×8.38×5.14mm) | |
| Difference: 21.79mm² (28%) |
4.66 carat Cushion (10.67×10.34×5.88mm) has approx. 28% more face-up area than 3.08 carat Oval (11.28×8.38×5.14mm).
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).
4.66ct Cushion (10.67×10.34×5.88mm)
3.08ct Oval (11.28×8.38×5.14mm)
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
Additional Info
4.66ct Cushion (10.67×10.34×5.88mm)
3.08ct Oval (11.28×8.38×5.14mm)
Face-up size
Too large for 4.66 carat Cushion
Normal for 3.08 carat Oval
Facets
usually 58
usually 58
Length
10.67 mm
11.28 mm
Width
10.34 mm
8.38 mm
Depth
5.88 mm
5.14 mm
Gram weight
0.93 g (0.0329 ounces)
0.62 g (0.0217 ounces)
Points
466 pts
308 pts
Volume
264.77 mm³
175 mm³
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Depth percentage for 4.66 carat Cushion (10.67×10.34×5.88mm)
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 56.9%, 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
4.66 carat
Cushion
(10.67×10.34×5.88mm) depth %:
Total depth: 5.88 mm
Width = 10.34 mm
Width = 10.34 mm
Depth % = (5.88 ÷ 10.34 ) × 100 = 56.9%
Depth percentage for 3.08 carat Oval (11.28×8.38×5.14mm)
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 61.3%, which is OK.
(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
3.08 carat
Oval
(11.28×8.38×5.14mm) depth %:
Total depth: 5.14 mm
Width = 8.38 mm
Width = 8.38 mm
Depth % = (5.14 ÷ 8.38 ) × 100 = 61.3%
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.
Diamonds that fall out of recommended depth range are generally less desirable and usually best to be avoided.
Face-up size evaluation for 4.66 carat Cushion (10.67×10.34×5.88mm)
The face-up size of this 4.66 carat Cushion
(10.67×10.34×5.88mm) is out of normal range for
4.66ct diamonds of this shape. Compared to 4.66
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 4.66ct 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.
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 4.66ct 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.
4.66 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 size evaluation for 3.08 carat Oval (11.28×8.38×5.14mm)
The face-up size of this 3.08 carat Oval
(11.28×8.38×5.14mm) is within the normal range for
3.08ct diamonds of this shape.
Compared to 3.08ct
Oval 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 3.1 carat Oval with less sparkle and the same face-up size as a well cut 2.8ct Oval, 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 3.1 carat Oval with less sparkle and the same face-up size as a well cut 2.8ct Oval, which one would you choose?
The bottom line:
A diamond must look its weight. This one does. Thumbs up.
3.08 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 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 4.66ct Cushion (10.67×10.34×5.88mm):
Top surface area = 99.3 mm²
Weight = 4.66ct
Face-up area per carat = 99.3 ÷ 4.66 = 21.31mm²/ct
Weight = 4.66ct
Face-up area per carat = 99.3 ÷ 4.66 = 21.31mm²/ct
Face-up area per carat
for 3.08ct Oval (11.28×8.38×5.14mm):
Top surface area = 77.51 mm²
Weight = 3.08ct
Face-up area per carat = 77.51 ÷ 3.08 = 25.17mm²/ct
Weight = 3.08ct
Face-up area per carat = 77.51 ÷ 3.08 = 25.17mm²/ct
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