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0.5ct Diamond (Cabochon, 5.67×3.78mm, White) vs 0.3ct Emerald (Marquise, 7.54×3.77mm, Green)


Quick summary: When looked from above (face-up position), 0.3ct Emerald (7.54×3.77mm, marquise cut) appears 15% larger than 0.5ct Diamond (5.67×3.78mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

0.5ct Diamond (cabochon cut)
vs
 0.3ct Emerald (marquise cut)
white
 
green
5.67×3.78 mm 7.54×3.77 mm
actual size
Actual size of 0.5ct Diamond (cabochon cut, 5.67×3.78mm, White color)   Actual size of 0.3ct Emerald (marquise cut, 7.54×3.77mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.5ct Diamond (cabochon cut, 5.67×3.78mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 0.3ct Emerald (marquise cut, 7.54×3.77mm) 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
 23% vs 23%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.5ct Diamond Cabochon (5.67×3.78mm, White) and 0.3ct Emerald Marquise (7.54×3.77mm, 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.


0.5 Ct Diamond (Cabochon) 0.3 Ct Emerald (Marquise)
5.67×3.78 mm vs 7.54×3.77 mm
17.57 mm²   20.18 mm²
Face-up size outline for 0.3ct Emerald (7.54×3.77mm, marquise cut)
Face-up size outline for 0.5ct Diamond (5.67×3.78mm, cabochon cut)
0.5ct Diamond Cabochon (5.67×3.78mm)
0.3ct Emerald Marquise (7.54×3.77mm)
Difference: 15% (2.61 mm²)
0.3ct Emerald (Marquise, 7.54×3.77mm) has approx. 15% more face-up area than 0.5ct Diamond (Cabochon, 5.67×3.78mm).


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