3.05 Carat Trillion (11.2×11.3×4.45mm) vs. 3 Carat Marquise (14×6.8×4.6mm)

Diamond comparison

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Actual size of 3.05ct Trillion diamond
Actual size
sample image
vs.
Actual size of 3ct Marquise diamond
Actual size
sample image
3.05 ct Trillion (11.2×11.3×4.45mm) 3 ct Marquise (14×6.8×4.6mm)
Price
n/a
Cutting style
Modified brilliant
Modified brilliant
Weight
3.05 ct
3 ct
Measurements
11.2×11.3×4.45 mm
14×6.8×4.6 mm
Total depth
39.7% OK
67.6% too deep!
L/W ratio
1.01
2.06
Face-up size
Adequate
Inadequate
 
This diamond LOOKS 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 3.05ct Trillion (11.2×11.3×4.45mm) and 3ct Marquise (14×6.8×4.6mm) 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
3.05ct Trillion on a left ring
64 mm
Right finger image
Ring on a right finger
3ct Marquise 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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3.05ct Trillion side view Side view of ring
vs
3ct Marquise side view Side view of ring
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Face-up area
78.47 mm²  (±9%)
67.59 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
3.05ct Trillion (11.2×11.3×4.45mm)
3ct Marquise (14×6.8×4.6mm)
Difference: 10.88mm² (16%)
3.05 carat Trillion (11.2×11.3×4.45mm) has approx. 16% more top surface area than 3 carat Marquise (14×6.8×4.6mm).
Face-up area per carat
25.73 mm²/ct
22.53 mm²/ct
To learn about the accuracy of these numbers, click here.

Quick Buying Guide

3.05ct Trillion (11.2×11.3×4.45mm)
3ct Marquise (14×6.8×4.6mm)
Min. clarity
SI or better
SI or better
Min. color (platinum solitaire)
H+
H+
Depth percentage
32 - 48%
59 - 65%
Table percentage
50 - 70%
53 - 65%
Length-to-width ratio
1.00 - 1.10
1.60 - 2.25
Min. polish/symmetry
Good or better
Good or better
 Detailed buying guide

Additional Info

3.05ct Trillion (11.2×11.3×4.45mm)
3ct Marquise (14×6.8×4.6mm)
Face-up size
Normal for 3.05 carat Trillion
Too small for 3 carat Marquise
Facets
Between 31 - 50
usually 58
Length
11.2 mm
14 mm
Width
11.3 mm
6.8 mm
Depth
4.45 mm
4.6 mm
Gram weight
0.61 g (0.0215 ounces)
0.6 g (0.0212 ounces)
Points
305 pts
300 pts
Volume
173.3 mm³
170.45 mm³


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Depth percentage for 3.05 carat Trillion (11.2×11.3×4.45mm)

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 39.7%, 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

3.05 carat Trillion (11.2×11.3×4.45mm) depth %:
Total depth: 4.45 mm
Width = 11.3 mm
Depth % = (4.45 ÷ 11.3 ) × 100 = 39.7%

Depth percentage for 3 carat Marquise (14×6.8×4.6mm)

Depth percentage of Marquise cut is the ratio of the total depth (measured from table to culet) to its width. The total depth percentage of this diamond is 67.6%, which is too deep!. (Recommended depth percentage for Marquises is between 59% and 65%)

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

3 carat Marquise (14×6.8×4.6mm) depth %:
Total depth: 4.6 mm
Width = 6.8 mm
Depth % = (4.6 ÷ 6.8 ) × 100 = 67.6%

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 3.05 carat Trillion (11.2×11.3×4.45mm)

The face-up size of this 3.05 carat Trillion (11.2×11.3×4.45mm) is within the normal range for 3.05ct diamonds of this shape. Compared to 3.05ct 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 3.05 carat Trillion that looks like a poorly cut 2.75ct.

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

3.05 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: 3.05ct
Depth: 40%
L/W ratio: 1
 
Calculated values:
Length: 11.22 mm
Width: 11.22 mm
Depth: 4.49 mm
*Est. face-up area: 78.05 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 3 carat Marquise (14×6.8×4.6mm)

The face-up size of this 3 carat Marquise (14×6.8×4.6mm) is out of normal range for 3ct diamonds of this shape. Compared to 3 carat Marquise 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 2.35ct Marquise.

3 carat Marquise reference diamond

Since there are no specific ideal proportions defined for Marquise cuts, an estimation formula is used to calculate the Marquise reference diamond.
Parameters:
Weight: 3ct
Depth: 61%
L/W ratio: 2
 
Calculated values:
Length: 14.98 mm
Width: 7.49 mm
Depth: 4.57 mm
*Est. face-up area: 79.66 mm²
Note: Marquise diamonds with face-up area of within 9% lower and 12% higher than reference Marquise diamond area are considered to be of adequate face-up size.
* Estimated Face-up area: Face-up area of Marquise 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 3.05ct Trillion (11.2×11.3×4.45mm):
Top surface area = 78.47 mm²
Weight = 3.05ct

Face-up area per carat = 78.47 ÷ 3.05 = 25.73mm²/ct

Face-up area per carat for 3ct Marquise (14×6.8×4.6mm):
Top surface area = 67.59 mm²
Weight = 3ct

Face-up area per carat = 67.59 ÷ 3 = 22.53mm²/ct

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