1.7 Carat Round (7.76×7.76×4.68mm) vs. 1.5 Carat Radiant (8.03×5.81×3.89mm)
Diamond comparison
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| 1.7 ct Round (7.76×7.76×4.68mm) | 1.5 ct Radiant (8.03×5.81×3.89mm) |
Cutting style
Brilliant
Mixed
Weight
1.7 ct
1.5 ct
Measurements
7.76×7.76×4.68 mm
8.03×5.81×3.89 mm
L/W ratio
1
1.38
Face-up size
Adequate
Adequate
This diamond LOOKS its weight!
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 1.7ct Round (7.76×7.76×4.68mm) and 1.5ct Radiant (8.03×5.81×3.89mm) 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.
Compare prices and availability from recommended online vendors:
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 1.7ct Round (7.76×7.76×4.68mm) and 1.5ct Radiant (8.03×5.81×3.89mm) 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.
Compare prices and availability from recommended online vendors:
Settings
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Ring:
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.
| 1.7ct Round (7.76×7.76×4.68mm) | |
| 1.5ct Radiant (8.03×5.81×3.89mm) | |
| Difference: 2.97mm² (7%) |
1.7 carat Round (7.76×7.76×4.68mm) has approx. 7% more top surface area than 1.5 carat Radiant (8.03×5.81×3.89mm).
To learn about the accuracy of these numbers, click here.
Quick Buying Guide
1.7ct Round (7.76×7.76×4.68mm)
1.5ct Radiant (8.03×5.81×3.89mm)
Min. clarity
SI or better
SI or better
Min. color (platinum solitaire)
J+
H+
Depth percentage
58 - 62.5%
59 - 70%
Table percentage
53 - 58%
58 - 70%
Length-to-width ratio
1.00 - 1.02
1.00 - 1.35
Min. polish/symmetry
Good or better
Good or better
Additional Info
1.7ct Round (7.76×7.76×4.68mm)
1.5ct Radiant (8.03×5.81×3.89mm)
Face-up size
Normal for 1.7 carat Round
Normal for 1.5 carat Radiant
Facets
58 (57 if no culet)
usually between 62 - 70
Length
7.76 mm
8.03 mm
Width
7.76 mm
5.81 mm
Depth
4.68 mm
3.89 mm
Gram weight
0.34 g (0.012 ounces)
0.3 g (0.0106 ounces)
Points
170 pts
150 pts
Volume
96.59 mm³
85.23 mm³
Compare diamonds
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Popular comparisons:
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- 1.7ct Round (7.76x7.76x4.68) vs. 1.92ct Round (7.78x7.74x5.12)
- 1.7ct Round (7.76x7.76x4.68) vs. 1ct Princess (5.51x5.51x3.97)
- 1.7ct Round (7.76x7.76x4.68) vs. 1.7ct Round (7.46x7.51x4.82)
- 1.7ct Round (7.76x7.76x4.68) vs. 1.7ct Cushion (6.95x6.95x4.45)
- 1.7ct Round (7.76x7.76x4.68) vs. 2.5ct Round (8.82x8.82x5.32)
- 1.7ct Round (7.76x7.76x4.68) vs. 1.57ct Round (7.55x7.55x4.55)
- 1.7ct Round (7.76x7.76x4.68) vs. 1.29ct Round (7.08x7.08x4.27)
- 1.7ct Round (7.76x7.76x4.68) vs. 1.7ct Asscher (6.7x6.7x4.36)
Depth percentage for 1.7 carat Round (7.76×7.76×4.68mm)
Depth percentage of Round cut is the ratio of the total depth (measured from table to culet)
to its average diameter. The total depth percentage of this diamond
is 60.3%, which is OK.
(Recommended depth percentage for Rounds is between 58% and
62.5%)
Depth percentage for rounds is calculated with the following formula:
Depth percentage for rounds is calculated with the following formula:
Depth % = (total depth ÷ average diameter) × 100
1.7 carat
Round
(7.76×7.76×4.68mm) depth %:
Total depth: 4.68 mm
Average diameter = (7.76 + 7.76) ÷ 2 = 7.76 mm
Average diameter = (7.76 + 7.76) ÷ 2 = 7.76 mm
Depth % = (4.68 ÷ 7.76 ) × 100 = 60.3%
Depth percentage for 1.5 carat Radiant (8.03×5.81×3.89mm)
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 67%, 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
1.5 carat
Radiant
(8.03×5.81×3.89mm) depth %:
Total depth: 3.89 mm
Width = 5.81 mm
Width = 5.81 mm
Depth % = (3.89 ÷ 5.81 ) × 100 = 67%
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 1.7 carat Round (7.76×7.76×4.68mm)
The face-up size of this 1.7 carat Round
(7.76×7.76×4.68mm) is within the normal range for
1.7ct diamonds of this shape.
Compared to 1.7ct
Round reference diamond (see below), this diamond is of adequate
size when viewed from the top.
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. You probably don't want a 1.7 carat Round that looks like a poorly cut 1.53ct.
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. You probably don't want a 1.7 carat Round that looks like a poorly cut 1.53ct.
The bottom line:
A diamond must look its weight. This one does.
1.7 carat Round reference diamond
1.7ct Round reference diamond is calculated from the following ideal proportions:
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Note: Round diamonds with face-up area of within 5% lower
and 3% higher than reference Round diamond area
are considered to be of adequate face-up size.
To learn more about diamond size evaluation, click here.
Face-up size evaluation for 1.5 carat Radiant (8.03×5.81×3.89mm)
The face-up size of this 1.5 carat Radiant
(8.03×5.81×3.89mm) is within the normal range for
1.5ct diamonds of this shape.
Compared to 1.5ct
Radiant reference diamond (see below), this diamond is of adequate
size when viewed from the top.
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. You probably don't want a 1.5 carat Radiant that looks like a poorly cut 1.35ct.
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. You probably don't want a 1.5 carat Radiant that looks like a poorly cut 1.35ct.
The bottom line:
A diamond must look its weight. This one does.
1.5 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.
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 1.7ct Round (7.76×7.76×4.68mm):
Top surface area = 47.29 mm²
Weight = 1.7ct
Face-up area per carat = 47.29 ÷ 1.7 = 27.82mm²/ct
Weight = 1.7ct
Face-up area per carat = 47.29 ÷ 1.7 = 27.82mm²/ct
Face-up area per carat
for 1.5ct Radiant (8.03×5.81×3.89mm):
Top surface area = 44.32 mm²
Weight = 1.5ct
Face-up area per carat = 44.32 ÷ 1.5 = 29.55mm²/ct
Weight = 1.5ct
Face-up area per carat = 44.32 ÷ 1.5 = 29.55mm²/ct
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