10ct Radiant (15.72×11.05×7.37 mm) vs 8ct Radiant (13.5×9×5.76 mm)
Diamond Size Comparison
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| 10 ct Radiant (15.72×11.05×7.37mm) | 8 ct Radiant (13.5×9×5.76mm) |
Cutting style
Mixed
Mixed
Weight
10 ct
8 ct
Measurements
15.72×11.05×7.37 mm
13.5×9×5.76 mm
L/W ratio
1.42
1.5
Face-up size
Borderline
Borderline
This diamond is borderline SPREAD CUT!
This diamond BARELY 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 10ct Radiant (15.72×11.05×7.37mm) and 8ct Radiant (13.5×9×5.76mm) 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.
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 10ct Radiant (15.72×11.05×7.37mm) and 8ct Radiant (13.5×9×5.76mm) 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.
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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.
| 10ct Radiant (15.72×11.05×7.37mm) | |
| 8ct Radiant (13.5×9×5.76mm) | |
| Difference: 49.59mm² (43%) |
10 carat Radiant (15.72×11.05×7.37mm) has approx. 43% more face-up area than 8 carat Radiant (13.5×9×5.76mm).
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. Radiant cut diamonds, for example, are quite forgiving of inclusions which means you can go relatively low on the clarity scale (down to SI). No one will be able to tell the difference (except your wallet). 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. Radiant cut diamonds, for example, are quite forgiving of inclusions which means you can go relatively low on the clarity scale (down to SI). No one will be able to tell the difference (except your wallet). 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).
10ct Radiant (15.72×11.05×7.37mm)
8ct Radiant (13.5×9×5.76mm)
Min. clarity
SI or better
SI or better
Min. color (platinum setting)
H+
H+
Min. color (yellow gold setting)
J+
J+
Depth percentage
59 - 70%
59 - 70%
Table percentage
58 - 70%
58 - 70%
Length-to-width ratio
1.00 - 1.35
1.00 - 1.35
Min. polish/symmetry
Good or better
Good or better
Additional Info
10ct Radiant (15.72×11.05×7.37mm)
8ct Radiant (13.5×9×5.76mm)
Face-up size
A bit large for 10 carat Radiant
A bit small for 8 carat Radiant
Facets
usually between 62 - 70
usually between 62 - 70
Length
15.72 mm
13.5 mm
Width
11.05 mm
9 mm
Depth
7.37 mm
5.76 mm
Gram weight
2 g (0.0705 ounces)
1.6 g (0.0564 ounces)
Points
1000 pts
800 pts
Volume
568.18 mm³
454.55 mm³
Compare diamonds
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Popular comparisons:
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- 10ct Radiant (15.72x11.05x7.37) vs. 8.16ct Cushion (13.47x11.01x7.44)
- 10ct Radiant (15.72x11.05x7.37) vs. 7.97ct Radiant (14.27x9.74x6.44)
- 10ct Radiant (15.72x11.05x7.37) vs. 6.71ct Cushion (12.84x10.33x6.91)
- 10ct Radiant (15.72x11.05x7.37) vs. 10ct Radiant (14x10x6.4)
- 10ct Radiant (15.72x11.05x7.37) vs. 10ct Oval (17.5x12.15x7.41)
- 10ct Radiant (15.72x11.05x7.37) vs. 4.66ct Radiant (11.82x8.03x5.2)
- 10ct Radiant (15.72x11.05x7.37) vs. 6ct Cushion (12x10x6.78)
- 10ct Radiant (15.72x11.05x7.37) vs. 6ct Cushion (12.2x10.2x6.78)
Depth percentage for 10 carat Radiant (15.72×11.05×7.37mm)
Depth percentage of Radiant cut is the ratio of the total depth (measured from table to culet)
to its width. The total depth percentage of this diamond
is 66.7%, which is OK.
(Recommended depth percentage for Radiants is between 59% and
70%)
Depth percentage for radiants is calculated with the following formula:
Depth percentage for radiants is calculated with the following formula:
Depth % = (total depth ÷ width) × 100
10 carat
Radiant
(15.72×11.05×7.37mm) depth %:
Total depth: 7.37 mm
Width = 11.05 mm
Width = 11.05 mm
Depth % = (7.37 ÷ 11.05 ) × 100 = 66.7%
Depth percentage for 8 carat Radiant (13.5×9×5.76mm)
Depth percentage of Radiant cut is the ratio of the total depth (measured from table to culet)
to its width. The total depth percentage of this diamond
is 64%, which is OK.
(Recommended depth percentage for Radiants is between 59% and
70%)
Depth percentage for radiants is calculated with the following formula:
Depth percentage for radiants is calculated with the following formula:
Depth % = (total depth ÷ width) × 100
8 carat
Radiant
(13.5×9×5.76mm) depth %:
Total depth: 5.76 mm
Width = 9 mm
Width = 9 mm
Depth % = (5.76 ÷ 9 ) × 100 = 64%
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 10 carat Radiant (15.72×11.05×7.37mm)
The face-up size of this 10 carat Radiant
(15.72×11.05×7.37mm) is slightly out of normal range for
10ct diamonds of this shape. Compared to 10
carat Radiant 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 10 carat Radiant 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 10 carat Radiant 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.
10 carat Radiant reference diamond
Since there are no specific ideal proportions defined for Radiant cuts,
an estimation formula is used to calculate the Radiant reference diamond.
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Note: Radiant diamonds with face-up area of within 9% lower
and 12% higher than reference Radiant diamond area
are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Radiant cuts
is only an estimation (±4%). Due to uniqueness of each stone,
it's impossible to accurately calculate face-up area given only a diamond's measurements.
Face-up size evaluation for 8 carat Radiant (13.5×9×5.76mm)
The face-up size of this 8 carat Radiant
(13.5×9×5.76mm) is slightly out of normal range for
8ct diamonds of this shape. Compared to 8
carat Radiant 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.
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 8ct Radiant looks like a well cut 6.94ct Radiant.
8 carat Radiant reference diamond
Since there are no specific ideal proportions defined for Radiant cuts,
an estimation formula is used to calculate the Radiant reference diamond.
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Note: Radiant diamonds with face-up area of within 9% lower
and 12% higher than reference Radiant diamond area
are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Radiant cuts
is only an estimation (±4%). Due to uniqueness of each stone,
it's impossible to accurately calculate face-up area given only a diamond's measurements.
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 10ct Radiant (15.72×11.05×7.37mm):
Top surface area = 165.02 mm²
Weight = 10ct
Face-up area per carat = 165.02 ÷ 10 = 16.5mm²/ct
Weight = 10ct
Face-up area per carat = 165.02 ÷ 10 = 16.5mm²/ct
Face-up area per carat
for 8ct Radiant (13.5×9×5.76mm):
Top surface area = 115.43 mm²
Weight = 8ct
Face-up area per carat = 115.43 ÷ 8 = 14.43mm²/ct
Weight = 8ct
Face-up area per carat = 115.43 ÷ 8 = 14.43mm²/ct
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