9.25ct Cushion (16×12×7.68) vs 10ct Emerald (16×12×7.8)

Diamond size comparison

Actual size is set for screen Change
Actual size of 9.25ct Cushion diamond
Actual size
sample image
vs.
Actual size of 10ct Emerald diamond
Actual size
sample image
9.25 ct Cushion (16×12×7.68mm) 10 ct Emerald (16×12×7.8mm)
Cutting style
(modified) brilliant
Step cut
Weight
9.25 ct
10 ct
Measurements
16×12×7.68 mm
16×12×7.8 mm
Total depth
64% OK
65% OK
L/W ratio
1.33
1.33
Face-up size
Inadequate
Inadequate
 
This diamond is a SPREAD CUT!
This diamond is a SPREAD CUT!
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 9.25ct Cushion (16×12×7.68mm) and 10ct Emerald (16×12×7.8mm) 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
Saved...
Left finger image
Ring on a left finger
9.25ct Cushion on a left ring
64 mm
Right finger image
Ring on a right finger
10ct Emerald 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
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
9.25ct Cushion side view Side view of ring
vs
10ct Emerald side view Side view of ring
Actual size is set for screen Change
Face-up area
172.8 mm²  (±5%)
182.4 mm²  (±4%)
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
9.25ct Cushion (16×12×7.68mm)
10ct Emerald (16×12×7.8mm)
Difference: 9.6mm² (6%)
10 carat Emerald (16×12×7.8mm) has approx. 6% more face-up area than 9.25 carat Cushion (16×12×7.68mm).
Face-up area per carat
18.68 mm²/ct
18.24 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, 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. 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).
9.25ct Cushion (16×12×7.68mm)
10ct Emerald (16×12×7.8mm)
Price (best value)
Min. clarity
SI1 or better
VS or better
Min. color (platinum setting)
H+
H+
Min. color (yellow gold setting)
J+
I+
Depth percentage
59 - 70%
60 - 69%
Table percentage
56 - 70%
58 - 69%
Length-to-width ratio
1.00 - 1.35
1.25 - 1.65
Min. polish/symmetry
Good or better
Good or better
 Detailed buying guide

Additional Info

9.25ct Cushion (16×12×7.68mm)
10ct Emerald (16×12×7.8mm)
Face-up size
Too large for 9.25 carat Cushion
Too large for 10 carat Emerald
Facets
usually 58
usually 58
Length
16 mm
16 mm
Width
12 mm
12 mm
Depth
7.68 mm
7.8 mm
Gram weight
1.85 g (0.0653 ounces)
2 g (0.0705 ounces)
Points
925 pts
1000 pts
Volume
525.57 mm³
568.18 mm³


Compare diamonds

Choose diamonds to compare:
 
× ×
carat vs. length* width* depth*
× ×
 
* Optional

Depth percentage for 9.25 carat Cushion (16×12×7.68mm)

Depth percentage of Cushion cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 64%, which is OK. (Recommended depth percentage for Cushions is between 59% and 70%)

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

9.25 carat Cushion (16×12×7.68mm) depth %:
Total depth: 7.68 mm
Width = 12 mm
Depth % = (7.68 ÷ 12 ) × 100 = 64%

Depth percentage for 10 carat Emerald (16×12×7.8mm)

Depth percentage of Emerald cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 65%, which is OK. (Recommended depth percentage for Emeralds is between 60% and 69%)

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

10 carat Emerald (16×12×7.8mm) depth %:
Total depth: 7.8 mm
Width = 12 mm
Depth % = (7.8 ÷ 12 ) × 100 = 65%

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 9.25 carat Cushion (16×12×7.68mm)

The face-up size of this 9.25 carat Cushion (16×12×7.68mm) is out of normal range for 9.25ct diamonds of this shape. Compared to 9.25 carat Cushion 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. If compared from above, it would look larger than a well cut 9.25ct Cushion. 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.

9.25 carat Cushion reference diamond
Since there are no specific ideal proportions defined for Cushion cuts, an estimation formula is used to calculate the Cushion reference diamond.
Parameters:
Weight: 9.25ct
Depth: 64%
L/W ratio: 1
 
Calculated values:
Length: 12.23 mm
Width: 12.23 mm
Depth: 7.83 mm
*Est. face-up area: 134.62 mm²
Note: Cushion diamonds with face-up area of within 9% lower and 12% higher than reference Cushion diamond area are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Cushion 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 10 carat Emerald (16×12×7.8mm)

The face-up size of this 10 carat Emerald (16×12×7.8mm) is out of normal range for 10ct diamonds of this shape. Compared to 10 carat Emerald 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. If compared from above, it would look larger than a well cut 10ct Emerald. 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.

10 carat Emerald reference diamond
Since there are no specific ideal proportions defined for Emerald cuts, an estimation formula is used to calculate the Emerald reference diamond.
Parameters:
Weight: 10ct
Depth: 65%
L/W ratio: 1.35
 
Calculated values:
Length: 14.42 mm
Width: 10.68 mm
Depth: 6.94 mm
*Est. face-up area: 146.31 mm²
Note: Emerald diamonds with face-up area of within 9% lower and 12% higher than reference Emerald diamond area are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Emerald 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 9.25ct Cushion (16×12×7.68mm):
Top surface area = 172.8 mm²
Weight = 9.25ct

Face-up area per carat = 172.8 ÷ 9.25 = 18.68mm²/ct

Face-up area per carat for 10ct Emerald (16×12×7.8mm):
Top surface area = 182.4 mm²
Weight = 10ct

Face-up area per carat = 182.4 ÷ 10 = 18.24mm²/ct

Enter your screen size (diagonal)

My screen size is  inches



Actual size is currently adjusted to screen.

If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a diamond, ring and finger will not be shown correctly.