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18ct Cubic Zirconia (Radiant, 12.87×12.87mm, White) vs 18ct Moissanite (Radiant, 15.52×15.52mm, White)


Quick summary: When looked from above (face-up position), 18ct Moissanite (15.52×15.52mm, radiant cut) appears 45% larger than 18ct Cubic Zirconia (12.87×12.87mm, radiant cut). See below how they compare side-by-side on a ring and finger.

18ct Cubic Zirconia (radiant cut)
vs
 18ct Moissanite (radiant cut)
white
 
white
12.87×12.87 mm 15.52×15.52 mm
actual size
Actual size of 18ct Cubic Zirconia (radiant cut, 12.87×12.87mm, White color)   Actual size of 18ct Moissanite (radiant cut, 15.52×15.52mm, White color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 18ct Cubic Zirconia (radiant cut, 12.87×12.87mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 18ct Moissanite (radiant cut, 15.52×15.52mm) 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
 77% vs 92%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 18ct Cubic Zirconia Radiant (12.87×12.87mm, White) and 18ct Moissanite Radiant (15.52×15.52mm, 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 Moissanite for a given carat weight, because it has higher specific gravity (5.65 vs. 3.22 - this means it's "heavier" compared to Moissanite 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.


18 Ct Cubic Zirconia (Radiant) 18 Ct Moissanite (Radiant)
12.87×12.87 mm vs 15.52×15.52 mm
157.36 mm²   228.83 mm²
Face-up size outline for 18ct Moissanite (15.52×15.52mm, radiant cut)
Face-up size outline for 18ct Cubic Zirconia (12.87×12.87mm, radiant cut)
18ct Cubic Zirconia Radiant (12.87×12.87mm)
18ct Moissanite Radiant (15.52×15.52mm)
Difference: 45% (71.47 mm²)
18ct Moissanite (Radiant, 15.52×15.52mm) has approx. 45% more face-up area than 18ct Cubic Zirconia (Radiant, 12.87×12.87mm).


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