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20ct Moissanite (Round, 18.21×18.21mm, White) vs 20ct Zircon (Round, 15.38×15.38mm, Orange)


Quick summary: When looked from above (face-up position), 20ct Moissanite (18.21×18.21mm, round cut) appears 40% larger than 20ct Zircon (15.38×15.38mm, round cut). See below how they compare side-by-side on a ring and finger.

20ct Moissanite (round cut)
vs
 20ct Zircon (round cut)
white
 
orange
18.21×18.21 mm 15.38×15.38 mm
actual size
Actual size of 20ct Moissanite (round cut, 18.21×18.21mm, White color)   Actual size of 20ct Zircon (round cut, 15.38×15.38mm, Orange color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 20ct Moissanite (round cut, 18.21×18.21mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Orange 20ct Zircon (round cut, 15.38×15.38mm) 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
 108% vs 92%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Moissanite Round (18.21×18.21mm, White) and 20ct Zircon Round (15.38×15.38mm, Orange) 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, Zircon will face-up smaller than Moissanite for a given carat weight, because it has higher specific gravity (4.7 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.


20 Ct Moissanite (Round) 20 Ct Zircon (Round)
18.21×18.21 mm vs 15.38×15.38 mm
260.44 mm²   185.78 mm²
Face-up size outline for 20ct Moissanite (18.21×18.21mm, round cut)
Face-up size outline for 20ct Zircon (15.38×15.38mm, round cut)
20ct Moissanite Round (18.21×18.21mm)
20ct Zircon Round (15.38×15.38mm)
Difference: 40% (74.66 mm²)
20ct Moissanite (Round, 18.21×18.21mm) has approx. 40% more face-up area than 20ct Zircon (Round, 15.38×15.38mm).


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