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0.4ct Diamond (Round, 4.5×4.5mm, White) vs 1ct Emerald (Emerald, 7.28×5.39mm, Green)


Quick summary: When looked from above (face-up position), 1ct Emerald (7.28×5.39mm, emerald cut) appears 2.3 times larger than 0.4ct Diamond (4.5×4.5mm, round cut). See below how they compare side-by-side on a ring and finger.

0.4ct Diamond (round cut)
vs
 1ct Emerald (emerald cut)
white
 
green
4.5×4.5 mm 7.28×5.39 mm
actual size
Actual size of 0.4ct Diamond (round cut, 4.5×4.5mm, White color)   Actual size of 1ct Emerald (emerald cut, 7.28×5.39mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.4ct Diamond (round cut, 4.5×4.5mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 1ct Emerald (emerald cut, 7.28×5.39mm) 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
 27% vs 32%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.4ct Diamond Round (4.5×4.5mm, White) and 1ct Emerald Emerald (7.28×5.39mm, 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.


0.4 Ct Diamond (Round) 1 Ct Emerald (Emerald)
4.5×4.5 mm vs 7.28×5.39 mm
15.9 mm²   36.49 mm²
Face-up size outline for 1ct Emerald (7.28×5.39mm, emerald cut)
Face-up size outline for 0.4ct Diamond (4.5×4.5mm, round cut)
0.4ct Diamond Round (4.5×4.5mm)
1ct Emerald Emerald (7.28×5.39mm)
Difference: 129% (20.59 mm²)
1ct Emerald (Emerald, 7.28×5.39mm) has approx. 129% more face-up area than 0.4ct Diamond (Round, 4.5×4.5mm). In other words, it's 2.29x larger.


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