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12ct Diamond (Marquise, 23.78×11.89mm, White) vs 12ct Emerald (Marquise, 25.32×12.66mm, Green)


Quick summary: When looked from above (face-up position), 12ct Emerald (25.32×12.66mm, marquise cut) appears 13% larger than 12ct Diamond (23.78×11.89mm, marquise cut). See below how they compare side-by-side on a ring and finger.

12ct Diamond (marquise cut)
vs
 12ct Emerald (marquise cut)
white
 
green
23.78×11.89 mm 25.32×12.66 mm
actual size
Actual size of 12ct Diamond (marquise cut, 23.78×11.89mm, White color)   Actual size of 12ct Emerald (marquise cut, 25.32×12.66mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 12ct Diamond (marquise cut, 23.78×11.89mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 12ct Emerald (marquise cut, 25.32×12.66mm) 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
 71% vs 75%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Diamond Marquise (23.78×11.89mm, White) and 12ct Emerald Marquise (25.32×12.66mm, Green) 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 Emerald for a given carat weight, because it has higher specific gravity (3.52 vs. 2.72 - this means it's "heavier" compared to Emerald 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.


12 Ct Diamond (Marquise) 12 Ct Emerald (Marquise)
23.78×11.89 mm vs 25.32×12.66 mm
200.75 mm²   227.59 mm²
Face-up size outline for 12ct Emerald (25.32×12.66mm, marquise cut)
Face-up size outline for 12ct Diamond (23.78×11.89mm, marquise cut)
12ct Diamond Marquise (23.78×11.89mm)
12ct Emerald Marquise (25.32×12.66mm)
Difference: 13% (26.84 mm²)
12ct Emerald (Marquise, 25.32×12.66mm) has approx. 13% more face-up area than 12ct Diamond (Marquise, 23.78×11.89mm).


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