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15ct Benitoite (Trillion, 17.87×17.87mm, Blue) vs 4ct Emerald (Round, 10.82×10.82mm, Green)


Quick summary: When looked from above (face-up position), 15ct Benitoite (17.87×17.87mm, trillion cut) appears 2.2 times larger than 4ct Emerald (10.82×10.82mm, round cut). See below how they compare side-by-side on a ring and finger.

15ct Benitoite (trillion cut)
vs
 4ct Emerald (round cut)
blue
 
green
17.87×17.87 mm 10.82×10.82 mm
actual size
Actual size of 15ct Benitoite (trillion cut, 17.87×17.87mm, Blue color)   Actual size of 4ct Emerald (round cut, 10.82×10.82mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 15ct Benitoite (trillion cut, 17.87×17.87mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 4ct Emerald (round cut, 10.82×10.82mm) 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
 106% vs 65%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 15ct Benitoite Trillion (17.87×17.87mm, Blue) and 4ct Emerald Round (10.82×10.82mm, 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, Benitoite will face-up smaller than Emerald for a given carat weight, because it has higher specific gravity (3.65 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.


15 Ct Benitoite (Trillion) 4 Ct Emerald (Round)
17.87×17.87 mm vs 10.82×10.82 mm
197.99 mm²   91.95 mm²
Face-up size outline for 15ct Benitoite (17.87×17.87mm, trillion cut)
Face-up size outline for 4ct Emerald (10.82×10.82mm, round cut)
15ct Benitoite Trillion (17.87×17.87mm)
4ct Emerald Round (10.82×10.82mm)
Difference: 115% (106.04 mm²)
15ct Benitoite (Trillion, 17.87×17.87mm) has approx. 115% more face-up area than 4ct Emerald (Round, 10.82×10.82mm). In other words, it's 2.15x larger.


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