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12ct Ruby (Oval, 17.31×11.54mm, Red) vs 5.5ct Emerald (Emerald, 12.85×9.52mm, Green)


Quick summary: When looked from above (face-up position), 12ct Ruby (17.31×11.54mm, oval cut) appears 44% larger than 5.5ct Emerald (12.85×9.52mm, emerald cut). See below how they compare side-by-side on a ring and finger.

12ct Ruby (oval cut)
vs
 5.5ct Emerald (emerald cut)
red
 
green
17.31×11.54 mm 12.85×9.52 mm
actual size
Actual size of 12ct Ruby (oval cut, 17.31×11.54mm, Red color)   Actual size of 5.5ct Emerald (emerald cut, 12.85×9.52mm, 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, 17.31×11.54mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 5.5ct Emerald (emerald cut, 12.85×9.52mm) 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 57%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Ruby Oval (17.31×11.54mm, Red) and 5.5ct Emerald Emerald (12.85×9.52mm, 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) 5.5 Ct Emerald (Emerald)
17.31×11.54 mm vs 12.85×9.52 mm
163.8 mm²   113.77 mm²
Face-up size outline for 12ct Ruby (17.31×11.54mm, oval cut)
Face-up size outline for 5.5ct Emerald (12.85×9.52mm, emerald cut)
12ct Ruby Oval (17.31×11.54mm)
5.5ct Emerald Emerald (12.85×9.52mm)
Difference: 44% (50.03 mm²)
12ct Ruby (Oval, 17.31×11.54mm) has approx. 44% more face-up area than 5.5ct Emerald (Emerald, 12.85×9.52mm).


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