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12ct Diamond (Oval, 18.59×12.39mm, White) vs 15ct Emerald (Emerald, 16.88×11.83mm, Green)


Quick summary: When looked from above (face-up position), 12ct Diamond (18.59×12.39mm, oval cut) appears 2% larger than 15ct Emerald (16.88×11.83mm, emerald cut). See below how they compare side-by-side on a ring and finger.

12ct Diamond (oval cut)
vs
 15ct Emerald (emerald cut)
white
 
green
18.59×12.39 mm 16.88×11.83 mm
actual size
Actual size of 12ct Diamond (oval cut, 18.59×12.39mm, White color)   Actual size of 15ct Emerald (emerald cut, 16.88×11.83mm, 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 (oval cut, 18.59×12.39mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 15ct Emerald (emerald cut, 16.88×11.83mm) 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
 74% vs 70%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Diamond Oval (18.59×12.39mm, White) and 15ct Emerald Emerald (16.88×11.83mm, 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 (Oval) 15 Ct Emerald (Emerald)
18.59×12.39 mm vs 16.88×11.83 mm
188.87 mm²   185.71 mm²
Face-up size outline for 12ct Diamond (18.59×12.39mm, oval cut)
Face-up size outline for 15ct Emerald (16.88×11.83mm, emerald cut)
12ct Diamond Oval (18.59×12.39mm)
15ct Emerald Emerald (16.88×11.83mm)
Difference: 2% (3.16 mm²)
12ct Diamond (Oval, 18.59×12.39mm) has approx. 2% more face-up area than 15ct Emerald (Emerald, 16.88×11.83mm).


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