7.71ct Radiant (11.2×9.6×6.14) vs 7.05ct Radiant (10.17×10.17×6.51)

Diamond size comparison

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Actual size of 7.71ct Radiant diamond
Actual size
sample image
vs.
Actual size of 7.05ct Radiant diamond
Actual size
sample image
7.71 ct Radiant (11.2×9.6×6.14mm) 7.05 ct Radiant (10.17×10.17×6.51mm)
Cutting style
Mixed
Mixed
Weight
7.71 ct
7.05 ct
Measurements
11.2×9.6×6.14 mm
10.17×10.17×6.51 mm
Total depth
64% OK
64% OK
L/W ratio
1.17
1
Face-up size
Inadequate
Inadequate
 
This diamond does NOT look its weight!
This diamond does NOT look 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 7.71ct Radiant (11.2×9.6×6.14mm) and 7.05ct Radiant (10.17×10.17×6.51mm) 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
7.71ct Radiant on a left ring
64 mm
Right finger image
Ring on a right finger
7.05ct Radiant 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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7.71ct Radiant side view Side view of ring
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7.05ct Radiant side view Side view of ring
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Face-up area
102.14 mm²  (±4%)
98.26 mm²  (±4%)
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
7.71ct Radiant (11.2×9.6×6.14mm)
7.05ct Radiant (10.17×10.17×6.51mm)
Difference: 3.88mm² (4%)
7.71 carat Radiant (11.2×9.6×6.14mm) has approx. 4% more face-up area than 7.05 carat Radiant (10.17×10.17×6.51mm).
Face-up area per carat
13.25 mm²/ct
13.94 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. 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).
7.71ct Radiant (11.2×9.6×6.14mm)
7.05ct Radiant (10.17×10.17×6.51mm)
Price (best value)
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
 Detailed buying guide

Additional Info

7.71ct Radiant (11.2×9.6×6.14mm)
7.05ct Radiant (10.17×10.17×6.51mm)
Face-up size
Too small for 7.71 carat Radiant
Too small for 7.05 carat Radiant
Facets
usually between 62 - 70
usually between 62 - 70
Length
11.2 mm
10.17 mm
Width
9.6 mm
10.17 mm
Depth
6.14 mm
6.51 mm
Gram weight
1.54 g (0.0544 ounces)
1.41 g (0.0497 ounces)
Points
771 pts
705 pts
Volume
438.07 mm³
400.57 mm³


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Depth percentage for 7.71 carat Radiant (11.2×9.6×6.14mm)

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 % = (total depth ÷ width) × 100

7.71 carat Radiant (11.2×9.6×6.14mm) depth %:
Total depth: 6.14 mm
Width = 9.6 mm
Depth % = (6.14 ÷ 9.6 ) × 100 = 64%

Depth percentage for 7.05 carat Radiant (10.17×10.17×6.51mm)

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 % = (total depth ÷ width) × 100

7.05 carat Radiant (10.17×10.17×6.51mm) depth %:
Total depth: 6.51 mm
Width = 10.17 mm
Depth % = (6.51 ÷ 10.17 ) × 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.


Face-up size evaluation for 7.71 carat Radiant (11.2×9.6×6.14mm)

The face-up size of this 7.71 carat Radiant (11.2×9.6×6.14mm) is out of normal range for 7.71ct diamonds of this shape. Compared to 7.71 carat Radiant reference diamond, this diamond appears too small when viewed from the top, which makes it a 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. This 7.71ct Radiant doesn't - from above, its size is comparable to a well cut 5.78ct Radiant.

7.71 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.
Parameters:
Weight: 7.71ct
Depth: 64%
L/W ratio: 1
 
Calculated values:
Length: 11.41 mm
Width: 11.41 mm
Depth: 7.3 mm
*Est. face-up area: 123.68 mm²
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.
To learn more about diamond size evaluation, click here.


Face-up size evaluation for 7.05 carat Radiant (10.17×10.17×6.51mm)

The face-up size of this 7.05 carat Radiant (10.17×10.17×6.51mm) is out of normal range for 7.05ct diamonds of this shape. Compared to 7.05 carat Radiant reference diamond, this diamond appears too small when viewed from the top, which makes it a 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. This 7.05ct Radiant doesn't - from above, its size is comparable to a well cut 5.45ct Radiant.

7.05 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.
Parameters:
Weight: 7.05ct
Depth: 64%
L/W ratio: 1
 
Calculated values:
Length: 11.08 mm
Width: 11.08 mm
Depth: 7.09 mm
*Est. face-up area: 116.63 mm²
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.
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 7.71ct Radiant (11.2×9.6×6.14mm):
Top surface area = 102.14 mm²
Weight = 7.71ct

Face-up area per carat = 102.14 ÷ 7.71 = 13.25mm²/ct

Face-up area per carat for 7.05ct Radiant (10.17×10.17×6.51mm):
Top surface area = 98.26 mm²
Weight = 7.05ct

Face-up area per carat = 98.26 ÷ 7.05 = 13.94mm²/ct

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