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13.21ct Aquamarine (Emerald, 21×11.5mm, Light Blue) vs 2.75ct Diamond (Cushion, 8.16×8.16mm, White)


Quick summary: When looked from above (face-up position), 13.21ct Aquamarine (21×11.5mm, emerald cut) appears 3.8 times larger than 2.75ct Diamond (8.16×8.16mm, cushion cut). See below how they compare side-by-side on a ring and finger.

13.21ct Aquamarine (emerald cut)
vs
 2.75ct Diamond (cushion cut)
light blue
 
white
21×11.5 mm 8.16×8.16 mm
actual size
Actual size of 13.21ct Aquamarine (emerald cut, 21×11.5mm, Light Blue color)   Actual size of 2.75ct Diamond (cushion cut, 8.16×8.16mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Blue 13.21ct Aquamarine (emerald cut, 21×11.5mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 2.75ct Diamond (cushion cut, 8.16×8.16mm) 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
 69% vs 49%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 13.21ct Aquamarine Emerald (21×11.5mm, Light Blue) and 2.75ct Diamond Cushion (8.16×8.16mm, White) 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 Aquamarine for a given carat weight, because it has higher specific gravity (3.52 vs. 2.72 - this means it's "heavier" compared to Aquamarine 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.


13.21 Ct Aquamarine (Emerald) 2.75 Ct Diamond (Cushion)
21×11.5 mm vs 8.16×8.16 mm
224.6 mm²   59.93 mm²
Face-up size outline for 13.21ct Aquamarine (21×11.5mm, emerald cut)
Face-up size outline for 2.75ct Diamond (8.16×8.16mm, cushion cut)
13.21ct Aquamarine Emerald (21×11.5mm)
2.75ct Diamond Cushion (8.16×8.16mm)
Difference: 275% (164.67 mm²)
13.21ct Aquamarine (Emerald, 21×11.5mm) has approx. 275% more face-up area than 2.75ct Diamond (Cushion, 8.16×8.16mm). In other words, it's 3.75x larger.


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