1ct Oval (8.43×5.32×3.2) vs 1.51ct Princess (6.84×6.4×4.28)

Diamond size comparison

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Actual size of 1ct Oval diamond
Actual size
sample image
vs.
Actual size of 1.51ct Princess diamond
Actual size
sample image
1 ct Oval (8.43×5.32×3.2mm) 1.51 ct Princess (6.84×6.4×4.28mm)
Cutting style
Modified brilliant
Modified brilliant
Weight
1 ct
1.51 ct
Measurements
8.43×5.32×3.2 mm
6.84×6.4×4.28 mm
Total depth
60.2% OK
66.9% OK
L/W ratio
1.58
1.07
Face-up size
Adequate
Adequate
 
This diamond LOOKS its weight!
This diamond LOOKS 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 1ct Oval (8.43×5.32×3.2mm) and 1.51ct Princess (6.84×6.4×4.28mm) 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
1ct Oval on a left ring
64 mm
Right finger image
Ring on a right finger
1.51ct Princess 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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1ct Oval side view Side view of ring
vs
1.51ct Princess side view Side view of ring
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Face-up area
36.78 mm²  (±5%)
43.78 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
1ct Oval (8.43×5.32×3.2mm)
1.51ct Princess (6.84×6.4×4.28mm)
Difference: 7mm² (19%)
1.51 carat Princess (6.84×6.4×4.28mm) has approx. 19% more face-up area than 1 carat Oval (8.43×5.32×3.2mm).
Face-up area per carat
36.78 mm²/ct
28.99 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, 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. 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).
1ct Oval (8.43×5.32×3.2mm)
1.51ct Princess (6.84×6.4×4.28mm)
Price (best value)
Min. clarity
SI or better
VS2, SI1 or better
Min. color (platinum setting)
I+
I+
Min. color (yellow gold setting)
J+
J+
Depth percentage
59 - 65%
64 - 75%
Table percentage
53 - 62%
60 - 75%
Length-to-width ratio
1.25 - 1.65
1.00 - 1.05
Min. polish/symmetry
Good or better
Good or better
 Detailed buying guide

Additional Info

1ct Oval (8.43×5.32×3.2mm)
1.51ct Princess (6.84×6.4×4.28mm)
Face-up size
Normal for 1 carat Oval
Normal for 1.51 carat Princess
Facets
usually 58
usually between 50 - 58
Length
8.43 mm
6.84 mm
Width
5.32 mm
6.4 mm
Depth
3.2 mm
4.28 mm
Gram weight
0.2 g (0.0071 ounces)
0.3 g (0.0107 ounces)
Points
100 pts
151 pts
Volume
56.82 mm³
85.8 mm³


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Depth percentage for 1 carat Oval (8.43×5.32×3.2mm)

Depth percentage of Oval cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 60.2%, which is OK. (Recommended depth percentage for Ovals is between 59% and 65%)

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

1 carat Oval (8.43×5.32×3.2mm) depth %:
Total depth: 3.2 mm
Width = 5.32 mm
Depth % = (3.2 ÷ 5.32 ) × 100 = 60.2%

Depth percentage for 1.51 carat Princess (6.84×6.4×4.28mm)

Depth percentage of Princess cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 66.9%, which is OK. (Recommended depth percentage for Princesses is between 64% and 75%)

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

1.51 carat Princess (6.84×6.4×4.28mm) depth %:
Total depth: 4.28 mm
Width = 6.4 mm
Depth % = (4.28 ÷ 6.4 ) × 100 = 66.9%

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 carat Oval (8.43×5.32×3.2mm)

The face-up size of this 1 carat Oval (8.43×5.32×3.2mm) is within the normal range for 1ct diamonds of this shape. Compared to 1ct Oval reference diamond (see below), this diamond is of adequate size when viewed from the top. In short, all is OK, this diamond looks its weight.

The importance of face-up size
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. Adequate size also indicates a good cut, meaning better light performance. For example, if given a choice between a poorly cut 1 carat Oval with less sparkle and the same face-up size as a well cut 0.9ct Oval, which one would you choose?

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

1 carat Oval reference diamond
Since there are no specific ideal proportions defined for Oval cuts, an estimation formula is used to calculate the Oval reference diamond.
Parameters:
Weight: 1ct
Depth: 61%
L/W ratio: 1.5
 
Calculated values:
Length: 8.12 mm
Width: 5.41 mm
Depth: 3.3 mm
*Est. face-up area: 36.02 mm²
Note: Oval diamonds with face-up area of within 9% lower and 12% higher than reference Oval diamond area are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Oval 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 1.51 carat Princess (6.84×6.4×4.28mm)

The face-up size of this 1.51 carat Princess (6.84×6.4×4.28mm) is within the normal range for 1.51ct diamonds of this shape. Compared to 1.51ct Princess reference diamond (see below), this diamond is of adequate size when viewed from the top. In short, all is OK, this diamond looks its weight.

The importance of face-up size
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. Adequate size also indicates a good cut, meaning better light performance. For example, if given a choice between a poorly cut 1.5 carat Princess with less sparkle and the same face-up size as a well cut 1.4ct Princess, which one would you choose?

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

1.51 carat Princess reference diamond
Since there are no specific ideal proportions defined for Princess cuts, an estimation formula is used to calculate the Princess reference diamond.
Parameters:
Weight: 1.51ct
Depth: 72%
L/W ratio: 1
 
Calculated values:
Length: 6.32 mm
Width: 6.32 mm
Depth: 4.55 mm
Face-up area: 39.94 mm²
Note: Princess diamonds with face-up area of within 8% lower and 12% higher than reference Princess 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 1ct Oval (8.43×5.32×3.2mm):
Top surface area = 36.78 mm²
Weight = 1ct

Face-up area per carat = 36.78 ÷ 1 = 36.78mm²/ct

Face-up area per carat for 1.51ct Princess (6.84×6.4×4.28mm):
Top surface area = 43.78 mm²
Weight = 1.51ct

Face-up area per carat = 43.78 ÷ 1.51 = 28.99mm²/ct

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