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4ct Diamond (Marquise, 16.48×8.24mm, White) vs 3ct Morganite (Emerald, 10.5×7.78mm, Light Purple)


Quick summary: When looked from above (face-up position), 4ct Diamond (16.48×8.24mm, marquise cut) appears 27% larger than 3ct Morganite (10.5×7.78mm, emerald cut). See below how they compare side-by-side on a ring and finger.

4ct Diamond (marquise cut)
vs
 3ct Morganite (emerald cut)
white
 
light purple
16.48×8.24 mm 10.5×7.78 mm
actual size
Actual size of 4ct Diamond (marquise cut, 16.48×8.24mm, White color)   Actual size of 3ct Morganite (emerald cut, 10.5×7.78mm, Light Purple color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 4ct Diamond (marquise cut, 16.48×8.24mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Purple 3ct Morganite (emerald cut, 10.5×7.78mm) 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
 49% vs 47%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Diamond Marquise (16.48×8.24mm, White) and 3ct Morganite Emerald (10.5×7.78mm, Light Purple) 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, Diamond will face-up smaller than Morganite for a given carat weight, because it has higher specific gravity (3.52 vs. 2.8 - this means it's "heavier" compared to Morganite 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.


4 Ct Diamond (Marquise) 3 Ct Morganite (Emerald)
16.48×8.24 mm vs 10.5×7.78 mm
96.41 mm²   75.97 mm²
Face-up size outline for 4ct Diamond (16.48×8.24mm, marquise cut)
Face-up size outline for 3ct Morganite (10.5×7.78mm, emerald cut)
4ct Diamond Marquise (16.48×8.24mm)
3ct Morganite Emerald (10.5×7.78mm)
Difference: 27% (20.44 mm²)
4ct Diamond (Marquise, 16.48×8.24mm) has approx. 27% more face-up area than 3ct Morganite (Emerald, 10.5×7.78mm).


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