1.77 Carat Asscher (6.23×6.19×4.88mm) vs. 1.97 Carat Round (7.47×7.24×4.85mm)

Diamond comparison

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Actual size of 1.77ct Asscher diamond
Actual size
sample image
vs.
Actual size of 1.97ct Round diamond
Actual size
sample image
1.77 ct Asscher (6.23×6.19×4.88mm) 1.97 ct Round (7.47×7.24×4.85mm)
Cutting style
Step cut
Brilliant
Weight
1.77 ct
1.97 ct
Measurements
6.23×6.19×4.88 mm
7.47×7.24×4.85 mm
Total depth
78.8% too deep!
65.9% too deep!
L/W ratio
1.01
1.03
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 1.77ct Asscher (6.23×6.19×4.88mm) and 1.97ct Round (7.47×7.24×4.85mm) 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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Settings
Ring: Skin tone:
Ring width: 3.0 mm
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Left finger image
Ring on a left finger
1.77ct Asscher on a left ring
64 mm
Right finger image
Ring on a right finger
1.97ct Round 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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1.77ct Asscher side view Side view of ring
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1.97ct Round side view Side view of ring
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Face-up area
35.48 mm²  (±5%)
42.48 mm² 
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
1.77ct Asscher (6.23×6.19×4.88mm)
1.97ct Round (7.47×7.24×4.85mm)
Difference: 7mm² (20%)
1.97 carat Round (7.47×7.24×4.85mm) has approx. 20% more top surface area than 1.77 carat Asscher (6.23×6.19×4.88mm).
Face-up area per carat
20.05 mm²/ct
21.56 mm²/ct
To learn about the accuracy of these numbers, click here.

Quick Buying Guide

1.77ct Asscher (6.23×6.19×4.88mm)
1.97ct Round (7.47×7.24×4.85mm)
Min. clarity
VS or better
SI or better
Min. color (platinum solitaire)
H+
J+
Depth percentage
60 - 69%
58 - 62.5%
Table percentage
58 - 69%
53 - 58%
Length-to-width ratio
1.00 - 1.05
1.00 - 1.02
Min. polish/symmetry
Good or better
Good or better
 Detailed buying guide

Additional Info

1.77ct Asscher (6.23×6.19×4.88mm)
1.97ct Round (7.47×7.24×4.85mm)
Face-up size
Too small for 1.77 carat Asscher
Too small for 1.97 carat Round
Facets
usually 58
58 (57 if no culet)
Length
6.23 mm
7.47 mm
Width
6.19 mm
7.24 mm
Depth
4.88 mm
4.85 mm
Gram weight
0.35 g (0.0125 ounces)
0.39 g (0.0139 ounces)
Points
177 pts
197 pts
Volume
100.57 mm³
111.93 mm³


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Depth percentage for 1.77 carat Asscher (6.23×6.19×4.88mm)

Depth percentage of Asscher cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 78.8%, which is too deep!. (Recommended depth percentage for Asschers is between 60% and 69%)

Depth percentage for asschers is calculated with the following formula:
Depth % = (total depth ÷ width) × 100

1.77 carat Asscher (6.23×6.19×4.88mm) depth %:
Total depth: 4.88 mm
Width = 6.19 mm
Depth % = (4.88 ÷ 6.19 ) × 100 = 78.8%

Depth percentage for 1.97 carat Round (7.47×7.24×4.85mm)

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 65.9%, which is too deep!. (Recommended depth percentage for Rounds is between 58% and 62.5%)

Depth percentage for rounds is calculated with the following formula:
Depth % = (total depth ÷ average diameter) × 100

1.97 carat Round (7.47×7.24×4.85mm) depth %:
Total depth: 4.85 mm
Average diameter = (7.47 + 7.24) ÷ 2 = 7.355 mm
Depth % = (4.85 ÷ 7.355 ) × 100 = 65.9%

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 1.77 carat Asscher (6.23×6.19×4.88mm)

The face-up size of this 1.77 carat Asscher (6.23×6.19×4.88mm) is out of normal range for 1.77ct diamonds of this shape. Compared to 1.77 carat Asscher 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 one doesn't - it looks like a well cut 1.35ct Asscher.

1.77 carat Asscher reference diamond

Since there are no specific ideal proportions defined for Asscher cuts, an estimation formula is used to calculate the Asscher reference diamond.
Parameters:
Weight: 1.77ct
Depth: 65%
L/W ratio: 1
 
Calculated values:
Length: 6.79 mm
Width: 6.79 mm
Depth: 4.41 mm
*Est. face-up area: 42.42 mm²
Note: Asscher diamonds with face-up area of within 9% lower and 12% higher than reference Asscher diamond area are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Asscher 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 1.97 carat Round (7.47×7.24×4.85mm)

The face-up size of this 1.97 carat Round (7.47×7.24×4.85mm) is out of normal range for 1.97ct diamonds of this shape. A well cut 1.97ct Round should have an average diameter between 7.94 and 8.27 mm. Compared to 1.97 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.

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 - it looks like a well cut 1.45ct Round.

1.97 carat Round reference diamond

1.97ct Round reference diamond is calculated from the following ideal proportions:
Proportions:
Table: 57%
Crown angle: 34°
Pavilion angle: 40.7°
Girdle: 2.8%
Star length: 50%
Lower half-length: 80%
Culet: None
 
Calculated values:
Depth: 60.3%
Crown height: 14.5%
Pavilion height: 43%
For 1.97 carat weight:
Diameter: 8.15 mm
Face-up area: 52.17 mm²
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 1.77ct Asscher (6.23×6.19×4.88mm):
Top surface area = 35.48 mm²
Weight = 1.77ct

Face-up area per carat = 35.48 ÷ 1.77 = 20.05mm²/ct

Face-up area per carat for 1.97ct Round (7.47×7.24×4.85mm):
Top surface area = 42.48 mm²
Weight = 1.97ct

Face-up area per carat = 42.48 ÷ 1.97 = 21.56mm²/ct

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