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20ct Diamond (Trillion, 21×21mm, White) vs 1ct Emerald (Round, 6.82×6.82mm, Green)


Quick summary: When looked from above (face-up position), 20ct Diamond (21×21mm, trillion cut) appears 7.5 times larger than 1ct Emerald (6.82×6.82mm, round cut). See below how they compare side-by-side on a ring and finger.

20ct Diamond (trillion cut)
vs
 1ct Emerald (round cut)
white
 
green
21×21 mm 6.82×6.82 mm
actual size
Actual size of 20ct Diamond (trillion cut, 21×21mm, White color)   Actual size of 1ct Emerald (round cut, 6.82×6.82mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 20ct Diamond (trillion cut, 21×21mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 1ct Emerald (round cut, 6.82×6.82mm) 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
 125% vs 41%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Diamond Trillion (21×21mm, White) and 1ct Emerald Round (6.82×6.82mm, 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.


20 Ct Diamond (Trillion) 1 Ct Emerald (Round)
21×21 mm vs 6.82×6.82 mm
273.42 mm²   36.53 mm²
Face-up size outline for 20ct Diamond (21×21mm, trillion cut)
Face-up size outline for 1ct Emerald (6.82×6.82mm, round cut)
20ct Diamond Trillion (21×21mm)
1ct Emerald Round (6.82×6.82mm)
Difference: 648% (236.89 mm²)
20ct Diamond (Trillion, 21×21mm) has approx. 648% more face-up area than 1ct Emerald (Round, 6.82×6.82mm). In other words, it's 7.48x larger.


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