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12ct Ruby (Oval, 17.55×11.7mm, Red) vs 8ct Emerald (Oval, 17.45×11.63mm, Green)


Quick summary: When looked from above (face-up position), 12ct Ruby (17.55×11.7mm, oval cut) appears 1% larger than 8ct Emerald (17.45×11.63mm, oval cut). See below how they compare side-by-side on a ring and finger.

12ct Ruby (oval cut)
vs
 8ct Emerald (oval cut)
red
 
green
17.55×11.7 mm 17.45×11.63 mm
actual size
Actual size of 12ct Ruby (oval cut, 17.55×11.7mm, Red color)   Actual size of 8ct Emerald (oval cut, 17.45×11.63mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 12ct Ruby (oval cut, 17.55×11.7mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 8ct Emerald (oval cut, 17.45×11.63mm) 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
 70% vs 69%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Ruby Oval (17.55×11.7mm, Red) and 8ct Emerald Oval (17.45×11.63mm, 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, Ruby will face-up smaller than Emerald for a given carat weight, because it has higher specific gravity (4 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.


12 Ct Ruby (Oval) 8 Ct Emerald (Oval)
17.55×11.7 mm vs 17.45×11.63 mm
168.37 mm²   166.41 mm²
Face-up size outline for 12ct Ruby (17.55×11.7mm, oval cut)
Face-up size outline for 8ct Emerald (17.45×11.63mm, oval cut)
12ct Ruby Oval (17.55×11.7mm)
8ct Emerald Oval (17.45×11.63mm)
Difference: 1% (1.96 mm²)
12ct Ruby (Oval, 17.55×11.7mm) has approx. 1% more face-up area than 8ct Emerald (Oval, 17.45×11.63mm).


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