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8ct Diamond (Marquise, 20.78×10.39mm, White) vs 12ct Diamond (Emerald, 15.3×11.33mm, White)


Quick summary: When looked from above (face-up position), 12ct Diamond (15.3×11.33mm, emerald cut) appears 5% larger than 8ct Diamond (20.78×10.39mm, marquise cut). See below how they compare side-by-side on a ring and finger.

8ct Diamond (marquise cut)
vs
 12ct Diamond (emerald cut)
white
 
white
20.78×10.39 mm 15.3×11.33 mm
actual size
Actual size of 8ct Diamond (marquise cut, 20.78×10.39mm, White color)   Actual size of 12ct Diamond (emerald cut, 15.3×11.33mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 8ct Diamond (marquise cut, 20.78×10.39mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 12ct Diamond (emerald cut, 15.3×11.33mm) 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
 62% vs 68%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Diamond Marquise (20.78×10.39mm, White) and 12ct Diamond Emerald (15.3×11.33mm, 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

The face-up size depends on the shape of the gem, its weight and 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.


8 Ct Diamond (Marquise) 12 Ct Diamond (Emerald)
20.78×10.39 mm vs 15.3×11.33 mm
153.29 mm²   161.21 mm²
Face-up size outline for 12ct Diamond (15.3×11.33mm, emerald cut)
Face-up size outline for 8ct Diamond (20.78×10.39mm, marquise cut)
8ct Diamond Marquise (20.78×10.39mm)
12ct Diamond Emerald (15.3×11.33mm)
Difference: 5% (7.92 mm²)
12ct Diamond (Emerald, 15.3×11.33mm) has approx. 5% more face-up area than 8ct Diamond (Marquise, 20.78×10.39mm).


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