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12ct Aquamarine (Oval, 19.97×13.31mm, Light Blue) vs 12ct Diamond (Oval, 18.59×12.39mm, White)


Quick summary: When looked from above (face-up position), 12ct Aquamarine (19.97×13.31mm, oval cut) appears 15% larger than 12ct Diamond (18.59×12.39mm, oval cut). See below how they compare side-by-side on a ring and finger.

12ct Aquamarine (oval cut)
vs
 12ct Diamond (oval cut)
light blue
 
white
19.97×13.31 mm 18.59×12.39 mm
actual size
Actual size of 12ct Aquamarine (oval cut, 19.97×13.31mm, Light Blue color)   Actual size of 12ct Diamond (oval cut, 18.59×12.39mm, 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 12ct Aquamarine (oval cut, 19.97×13.31mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 12ct Diamond (oval cut, 18.59×12.39mm) 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
 79% vs 74%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Aquamarine Oval (19.97×13.31mm, Light Blue) and 12ct Diamond Oval (18.59×12.39mm, 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.


12 Ct Aquamarine (Oval) 12 Ct Diamond (Oval)
19.97×13.31 mm vs 18.59×12.39 mm
217.96 mm²   188.87 mm²
Face-up size outline for 12ct Aquamarine (19.97×13.31mm, oval cut)
Face-up size outline for 12ct Diamond (18.59×12.39mm, oval cut)
12ct Aquamarine Oval (19.97×13.31mm)
12ct Diamond Oval (18.59×12.39mm)
Difference: 15% (29.09 mm²)
12ct Aquamarine (Oval, 19.97×13.31mm) has approx. 15% more face-up area than 12ct Diamond (Oval, 18.59×12.39mm).


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