1.5 Carat Round (7.44×7.44×4.49mm) vs. 2 Carat Round (7.76×7.76×4.68mm)

Diamond comparison

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Actual size of 1.5ct Round diamond
Actual size
sample image
vs.
Actual size of 2ct Round diamond
Actual size
sample image
1.5 ct Round (7.44×7.44×4.49mm) 2 ct Round (7.76×7.76×4.68mm)
Cutting style
Brilliant
Brilliant
Weight
1.5 ct
2 ct
Measurements
7.44×7.44×4.49 mm
7.76×7.76×4.68 mm
Total depth
60.3% OK
60.3% OK
L/W ratio
1
1
Face-up size
Adequate
Inadequate
 
This diamond LOOKS its weight!
This diamond does NOT look 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).

On the right you can see the actual sizes of 1.5ct Round (7.44×7.44×4.49mm) and 2ct Round (7.76×7.76×4.68mm) 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
1.5ct Round on a left ring
64 mm
Right finger image
Ring on a right finger
2ct 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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1.5ct Round side view Side view of ring
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2ct Round side view Side view of ring
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Face-up area
43.47 mm² 
47.29 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
1.5ct Round (7.44×7.44×4.49mm)
2ct Round (7.76×7.76×4.68mm)
Difference: 3.82mm² (9%)
2 carat Round (7.76×7.76×4.68mm) has approx. 9% more top surface area than 1.5 carat Round (7.44×7.44×4.49mm).
Face-up area per carat
28.98 mm²/ct
23.65 mm²/ct
To learn about the accuracy of these numbers, click here.

Quick Buying Guide

1.5ct Round (7.44×7.44×4.49mm)
2ct Round (7.76×7.76×4.68mm)
Min. clarity
SI or better
SI or better
Min. color (platinum solitaire)
J+
J+
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
 Detailed buying guide

Additional Info

1.5ct Round (7.44×7.44×4.49mm)
2ct Round (7.76×7.76×4.68mm)
Face-up size
Normal for 1.5 carat Round
Too small for 2 carat Round
Facets
58 (57 if no culet)
58 (57 if no culet)
Length
7.44 mm
7.76 mm
Width
7.44 mm
7.76 mm
Depth
4.49 mm
4.68 mm
Gram weight
0.3 g (0.0106 ounces)
0.4 g (0.0141 ounces)
Points
150 pts
200 pts
Volume
85.23 mm³
113.64 mm³


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Depth percentage for 1.5 carat Round (7.44×7.44×4.49mm)

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 % = (total depth ÷ average diameter) × 100

1.5 carat Round (7.44×7.44×4.49mm) depth %:
Total depth: 4.49 mm
Average diameter = (7.44 + 7.44) ÷ 2 = 7.44 mm
Depth % = (4.49 ÷ 7.44 ) × 100 = 60.3%

Depth percentage for 2 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 % = (total depth ÷ average diameter) × 100

2 carat Round (7.76×7.76×4.68mm) depth %:
Total depth: 4.68 mm
Average diameter = (7.76 + 7.76) ÷ 2 = 7.76 mm
Depth % = (4.68 ÷ 7.76 ) × 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.


Face-up size evaluation for 1.5 carat Round (7.44×7.44×4.49mm)

The face-up size of this 1.5 carat Round (7.44×7.44×4.49mm) is within the normal range for 1.5ct diamonds of this shape. Compared to 1.5ct 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 1.5 carat Round that looks like a poorly cut 1.35ct.

The bottom line: A diamond must look its weight. This one does.

1.5 carat Round reference diamond

1.5ct 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 1.5 carat weight:
Diameter: 7.44 mm
Face-up area: 43.47 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 size evaluation for 2 carat Round (7.76×7.76×4.68mm)

The face-up size of this 2 carat Round (7.76×7.76×4.68mm) is out of normal range for 2ct diamonds of this shape. A well cut 2ct Round should have an average diameter between 7.98 and 8.31 mm. Compared to 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.

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 1.7ct Round.

2 carat Round reference diamond

2ct 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 2 carat weight:
Diameter: 8.19 mm
Face-up area: 52.68 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 1.5ct Round (7.44×7.44×4.49mm):
Top surface area = 43.47 mm²
Weight = 1.5ct

Face-up area per carat = 43.47 ÷ 1.5 = 28.98mm²/ct


Face-up area per carat for 2ct Round (7.76×7.76×4.68mm):
Top surface area = 47.29 mm²
Weight = 2ct

Face-up area per carat = 47.29 ÷ 2 = 23.65mm²/ct


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