1.2ct Round (6.5×6.5×3.92) vs 0.5ct Round (5.77×5.77×3.48)
Diamond size comparison
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1.2 ct Round (6.5×6.5×3.92mm) | 0.5 ct Round (5.77×5.77×3.48mm) |
Cutting style
Brilliant
Brilliant
Weight
1.2 ct
0.5 ct
Measurements
6.5×6.5×3.92 mm
5.77×5.77×3.48 mm
L/W ratio
1
1
Face-up size
Inadequate
Inadequate
This diamond does NOT look its weight!
This diamond is a SPREAD CUT!
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 1.2ct Round (6.5×6.5×3.92mm) and 0.5ct Round (5.77×5.77×3.48mm) 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 1.2ct Round (6.5×6.5×3.92mm) and 0.5ct Round (5.77×5.77×3.48mm) 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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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.
1.2ct Round (6.5×6.5×3.92mm) | |
0.5ct Round (5.77×5.77×3.48mm) | |
Difference: 7.03mm² (27%) |
1.2 carat Round (6.5×6.5×3.92mm) has approx. 27% more face-up area than 0.5 carat Round (5.77×5.77×3.48mm).
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. With Rounds, for example, you can go relatively low in terms of color and clarity without compromising on beauty. However, you should never skimp on the cut. 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. With Rounds, for example, you can go relatively low in terms of color and clarity without compromising on beauty. However, you should never skimp on the cut. 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).
1.2ct Round (6.5×6.5×3.92mm)
0.5ct Round (5.77×5.77×3.48mm)
Min. clarity
SI or better
SI or better
Min. color (platinum setting)
J+
J+
Min. color (yellow gold setting)
K+
K+
Depth percentage
58 - 62.5%
58 - 62.5%
Table percentage
53 - 58%
53 - 58%
Length-to-width ratio
1.00 - 1.02
1.00 - 1.02
Min. polish/symmetry
Good or better
Good or better
Additional Info
1.2ct Round (6.5×6.5×3.92mm)
0.5ct Round (5.77×5.77×3.48mm)
Face-up size
Too small for 1.2 carat Round
Too large for 0.5 carat Round
Facets
58 (57 if no culet)
58 (57 if no culet)
Length
6.5 mm
5.77 mm
Width
6.5 mm
5.77 mm
Depth
3.92 mm
3.48 mm
Gram weight
0.24 g (0.0085 ounces)
0.1 g (0.0035 ounces)
Points
120 pts
50 pts
Volume
68.18 mm³
28.41 mm³
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Depth percentage for 1.2 carat Round (6.5×6.5×3.92mm)
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
1.2 carat
Round
(6.5×6.5×3.92mm) depth %:
Total depth: 3.92 mm
Average diameter = (6.5 + 6.5) ÷ 2 = 6.5 mm
Average diameter = (6.5 + 6.5) ÷ 2 = 6.5 mm
Depth % = (3.92 ÷ 6.5 ) × 100 = 60.3%
Depth percentage for 0.5 carat Round (5.77×5.77×3.48mm)
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
0.5 carat
Round
(5.77×5.77×3.48mm) depth %:
Total depth: 3.48 mm
Average diameter = (5.77 + 5.77) ÷ 2 = 5.77 mm
Average diameter = (5.77 + 5.77) ÷ 2 = 5.77 mm
Depth % = (3.48 ÷ 5.77 ) × 100 = 60.3%
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 1.2 carat Round (6.5×6.5×3.92mm)
The face-up size of this 1.2 carat Round
(6.5×6.5×3.92mm) is out of normal range for
1.2ct diamonds of this shape. A well cut 1.2ct Round
should have an average diameter between 6.74 and 7.01 mm. Compared to 1.2
carat Round 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.
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 one doesn't - sizewise, it looks like a well cut 1ct diamond.
1.2 carat Round reference diamond
1.2ct 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 0.5 carat Round (5.77×5.77×3.48mm)
The face-up size of this 0.5 carat Round
(5.77×5.77×3.48mm) is out of normal range for
0.5ct diamonds of this shape. Compared to 0.5
carat Round 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. From above it looks larger than an ideal 0.5ct diamond. 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. From above it looks larger than an ideal 0.5ct diamond. 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.
0.5 carat Round reference diamond
0.5ct 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 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 1.2ct Round (6.5×6.5×3.92mm):
Top surface area = 33.18 mm²
Weight = 1.2ct
Face-up area per carat = 33.18 ÷ 1.2 = 27.65mm²/ct
Weight = 1.2ct
Face-up area per carat = 33.18 ÷ 1.2 = 27.65mm²/ct
Face-up area per carat
for 0.5ct Round (5.77×5.77×3.48mm):
Top surface area = 26.15 mm²
Weight = 0.5ct
Face-up area per carat = 26.15 ÷ 0.5 = 52.3mm²/ct
Weight = 0.5ct
Face-up area per carat = 26.15 ÷ 0.5 = 52.3mm²/ct
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