2 Carat Trillion (9.75×9.75×3.9mm) vs. 1.85 Carat Trillion (9.5×9.5×3.8mm)

Diamond comparison

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Actual size of 2ct Trillion diamond
Actual size
sample image
vs.
Actual size of 1.85ct Trillion diamond
Actual size
sample image
2 ct Trillion (9.75×9.75×3.9mm) 1.85 ct Trillion (9.5×9.5×3.8mm)
Price
n/a
n/a
Cutting style
Modified brilliant
Modified brilliant
Weight
2 ct
1.85 ct
Measurements
9.75×9.75×3.9 mm
9.5×9.5×3.8 mm
Total depth
40% OK
40% OK
L/W ratio
1
1
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 2ct Trillion (9.75×9.75×3.9mm) and 1.85ct Trillion (9.5×9.5×3.8mm) 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.

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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
2ct Trillion on a left ring
64 mm
Right finger image
Ring on a right finger
1.85ct Trillion 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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2ct Trillion side view Side view of ring
vs
1.85ct Trillion side view Side view of ring
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Face-up area
58.94 mm²  (±9%)
55.96 mm²  (±9%)
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
2ct Trillion (9.75×9.75×3.9mm)
1.85ct Trillion (9.5×9.5×3.8mm)
Difference: 2.98mm² (5%)
2 carat Trillion (9.75×9.75×3.9mm) has approx. 5% more top surface area than 1.85 carat Trillion (9.5×9.5×3.8mm).
Face-up area per carat
29.47 mm²/ct
30.25 mm²/ct
To learn about the accuracy of these numbers, click here.

Quick Buying Guide

2ct Trillion (9.75×9.75×3.9mm)
1.85ct Trillion (9.5×9.5×3.8mm)
Min. clarity
SI or better
SI or better
Min. color (platinum solitaire)
H+
H+
Depth percentage
32 - 48%
32 - 48%
Table percentage
50 - 70%
50 - 70%
Length-to-width ratio
1.00 - 1.10
1.00 - 1.10
Min. polish/symmetry
Good or better
Good or better
 Detailed buying guide

Additional Info

2ct Trillion (9.75×9.75×3.9mm)
1.85ct Trillion (9.5×9.5×3.8mm)
Face-up size
Normal for 2 carat Trillion
Normal for 1.85 carat Trillion
Facets
Between 31 - 50
Between 31 - 50
Length
9.75 mm
9.5 mm
Width
9.75 mm
9.5 mm
Depth
3.9 mm
3.8 mm
Gram weight
0.4 g (0.0141 ounces)
0.37 g (0.0131 ounces)
Points
200 pts
185 pts
Volume
113.64 mm³
105.11 mm³


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Depth percentage for 2 carat Trillion (9.75×9.75×3.9mm)

Depth percentage of Trillion cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 40%, which is OK. (Recommended depth percentage for Trillions is between 32% and 48%)

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

2 carat Trillion (9.75×9.75×3.9mm) depth %:
Total depth: 3.9 mm
Width = 9.75 mm
Depth % = (3.9 ÷ 9.75 ) × 100 = 40%

Depth percentage for 1.85 carat Trillion (9.5×9.5×3.8mm)

Depth percentage of Trillion cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 40%, which is OK. (Recommended depth percentage for Trillions is between 32% and 48%)

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

1.85 carat Trillion (9.5×9.5×3.8mm) depth %:
Total depth: 3.8 mm
Width = 9.5 mm
Depth % = (3.8 ÷ 9.5 ) × 100 = 40%

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 2 carat Trillion (9.75×9.75×3.9mm)

The face-up size of this 2 carat Trillion (9.75×9.75×3.9mm) is within the normal range for 2ct diamonds of this shape. Compared to 2ct Trillion 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 2 carat Trillion that looks like a poorly cut 1.8ct.

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

2 carat Trillion reference diamond

Since there are no specific ideal proportions defined for Trillion cuts, an estimation formula is used to calculate the Trillion reference diamond.
Parameters:
Weight: 2ct
Depth: 40%
L/W ratio: 1
 
Calculated values:
Length: 9.75 mm
Width: 9.75 mm
Depth: 3.9 mm
*Est. face-up area: 58.94 mm²
Note: Trillion diamonds with face-up area of within 13% lower and 16% higher than reference Trillion diamond area are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Trillion cuts is only an estimation (±9%). 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 1.85 carat Trillion (9.5×9.5×3.8mm)

The face-up size of this 1.85 carat Trillion (9.5×9.5×3.8mm) is within the normal range for 1.85ct diamonds of this shape. Compared to 1.85ct Trillion 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 1.85 carat Trillion that looks like a poorly cut 1.67ct.

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

1.85 carat Trillion reference diamond

Since there are no specific ideal proportions defined for Trillion cuts, an estimation formula is used to calculate the Trillion reference diamond.
Parameters:
Weight: 1.85ct
Depth: 40%
L/W ratio: 1
 
Calculated values:
Length: 9.5 mm
Width: 9.5 mm
Depth: 3.8 mm
*Est. face-up area: 55.96 mm²
Note: Trillion diamonds with face-up area of within 13% lower and 16% higher than reference Trillion diamond area are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Trillion cuts is only an estimation (±9%). 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 2ct Trillion (9.75×9.75×3.9mm):
Top surface area = 58.94 mm²
Weight = 2ct

Face-up area per carat = 58.94 ÷ 2 = 29.47mm²/ct

Face-up area per carat for 1.85ct Trillion (9.5×9.5×3.8mm):
Top surface area = 55.96 mm²
Weight = 1.85ct

Face-up area per carat = 55.96 ÷ 1.85 = 30.25mm²/ct

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