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7.5ct Diamond (Trillion, 15.14×15.14mm, White) vs 7.5ct Cubic Zirconia (Trillion, 12.75×12.75mm, White)


Quick summary: When looked from above (face-up position), 7.5ct Diamond (15.14×15.14mm, trillion cut) appears 41% larger than 7.5ct Cubic Zirconia (12.75×12.75mm, trillion cut). See below how they compare side-by-side on a ring and finger.

7.5ct Diamond (trillion cut)
vs
 7.5ct Cubic Zirconia (trillion cut)
white
 
white
15.14×15.14 mm 12.75×12.75 mm
actual size
Actual size of 7.5ct Diamond (trillion cut, 15.14×15.14mm, White color)   Actual size of 7.5ct Cubic Zirconia (trillion cut, 12.75×12.75mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 7.5ct Diamond (trillion cut, 15.14×15.14mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 7.5ct Cubic Zirconia (trillion cut, 12.75×12.75mm) on a right ring and finger
Your settings
Ring
 Gold
Skin tone
 Light
Ring diameter
 16.9 mm
Ring width
 3.0 mm
Finger length
 64 mm
Finger coverage
 90% vs 76%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 7.5ct Diamond Trillion (15.14×15.14mm, White) and 7.5ct Cubic Zirconia Trillion (12.75×12.75mm, White) as they would appear on a ring and finger. Adjust the ring and finger size to get an idea of how these gemstones would look on your finger.

Where to buy?

For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile

Face-up Size

All things being equal, Cubic Zirconia will face-up smaller than Diamond for a given carat weight, because it has higher specific gravity (5.65 vs. 3.52 - this means it's "heavier" compared to Diamond of the same size). Face-up size also depends heavily on the proportions of the cut.

Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.


7.5 Ct Diamond (Trillion) 7.5 Ct Cubic Zirconia (Trillion)
15.14×15.14 mm vs 12.75×12.75 mm
142.12 mm²   100.79 mm²
Face-up size outline for 7.5ct Diamond (15.14×15.14mm, trillion cut)
Face-up size outline for 7.5ct Cubic Zirconia (12.75×12.75mm, trillion cut)
7.5ct Diamond Trillion (15.14×15.14mm)
7.5ct Cubic Zirconia Trillion (12.75×12.75mm)
Difference: 41% (41.33 mm²)
7.5ct Diamond (Trillion, 15.14×15.14mm) has approx. 41% more face-up area than 7.5ct Cubic Zirconia (Trillion, 12.75×12.75mm).


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