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9ct Diamond (Cushion, 12.12×12.12mm, White) vs 8ct Emerald (Round, 13.63×13.63mm, Green)


Quick summary: When looked from above (face-up position), 8ct Emerald (13.63×13.63mm, round cut) appears 10% larger than 9ct Diamond (12.12×12.12mm, cushion cut). See below how they compare side-by-side on a ring and finger.

9ct Diamond (cushion cut)
vs
 8ct Emerald (round cut)
white
 
green
12.12×12.12 mm 13.63×13.63 mm
actual size
Actual size of 9ct Diamond (cushion cut, 12.12×12.12mm, White color)   Actual size of 8ct Emerald (round cut, 13.63×13.63mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 9ct Diamond (cushion cut, 12.12×12.12mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 8ct Emerald (round cut, 13.63×13.63mm) 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
 72% vs 81%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 9ct Diamond Cushion (12.12×12.12mm, White) and 8ct Emerald Round (13.63×13.63mm, 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.


9 Ct Diamond (Cushion) 8 Ct Emerald (Round)
12.12×12.12 mm vs 13.63×13.63 mm
132.2 mm²   145.91 mm²
Face-up size outline for 8ct Emerald (13.63×13.63mm, round cut)
Face-up size outline for 9ct Diamond (12.12×12.12mm, cushion cut)
9ct Diamond Cushion (12.12×12.12mm)
8ct Emerald Round (13.63×13.63mm)
Difference: 10% (13.71 mm²)
8ct Emerald (Round, 13.63×13.63mm) has approx. 10% more face-up area than 9ct Diamond (Cushion, 12.12×12.12mm).


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