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1ct Diamond (Radiant, 5.78×5.78mm, White) vs 12.34ct Emerald (Emerald, 16.78×12.43mm, Green)


Quick summary: When looked from above (face-up position), 12.34ct Emerald (16.78×12.43mm, emerald cut) appears 6.1 times larger than 1ct Diamond (5.78×5.78mm, radiant cut). See below how they compare side-by-side on a ring and finger.

1ct Diamond (radiant cut)
vs
 12.34ct Emerald (emerald cut)
white
 
green
5.78×5.78 mm 16.78×12.43 mm
actual size
Actual size of 1ct Diamond (radiant cut, 5.78×5.78mm, White color)   Actual size of 12.34ct Emerald (emerald cut, 16.78×12.43mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1ct Diamond (radiant cut, 5.78×5.78mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 12.34ct Emerald (emerald cut, 16.78×12.43mm) 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
 35% vs 74%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Diamond Radiant (5.78×5.78mm, White) and 12.34ct Emerald Emerald (16.78×12.43mm, 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.


1 Ct Diamond (Radiant) 12.34 Ct Emerald (Emerald)
5.78×5.78 mm vs 16.78×12.43 mm
31.74 mm²   193.98 mm²
Face-up size outline for 12.34ct Emerald (16.78×12.43mm, emerald cut)
Face-up size outline for 1ct Diamond (5.78×5.78mm, radiant cut)
1ct Diamond Radiant (5.78×5.78mm)
12.34ct Emerald Emerald (16.78×12.43mm)
Difference: 511% (162.24 mm²)
12.34ct Emerald (Emerald, 16.78×12.43mm) has approx. 511% more face-up area than 1ct Diamond (Radiant, 5.78×5.78mm). In other words, it's 6.11x larger.


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