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30ct Cubic Zirconia (Cabochon, 18.95×12.63mm, White) vs 30ct Moissanite (Cabochon, 22.86×15.24mm, White)


Quick summary: When looked from above (face-up position), 30ct Moissanite (22.86×15.24mm, cabochon cut) appears 46% larger than 30ct Cubic Zirconia (18.95×12.63mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

30ct Cubic Zirconia (cabochon cut)
vs
 30ct Moissanite (cabochon cut)
white
 
white
18.95×12.63 mm 22.86×15.24 mm
actual size
Actual size of 30ct Cubic Zirconia (cabochon cut, 18.95×12.63mm, White color)   Actual size of 30ct Moissanite (cabochon cut, 22.86×15.24mm, White color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 30ct Cubic Zirconia (cabochon cut, 18.95×12.63mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 30ct Moissanite (cabochon cut, 22.86×15.24mm) 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
 75% vs 91%
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Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 30ct Cubic Zirconia Cabochon (18.95×12.63mm, White) and 30ct Moissanite Cabochon (22.86×15.24mm, 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.


30 Ct Cubic Zirconia (Cabochon) 30 Ct Moissanite (Cabochon)
18.95×12.63 mm vs 22.86×15.24 mm
196.26 mm²   285.68 mm²
Face-up size outline for 30ct Moissanite (22.86×15.24mm, cabochon cut)
Face-up size outline for 30ct Cubic Zirconia (18.95×12.63mm, cabochon cut)
30ct Cubic Zirconia Cabochon (18.95×12.63mm)
30ct Moissanite Cabochon (22.86×15.24mm)
Difference: 46% (89.42 mm²)
30ct Moissanite (Cabochon, 22.86×15.24mm) has approx. 46% more face-up area than 30ct Cubic Zirconia (Cabochon, 18.95×12.63mm).


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