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4ct Sapphire (Oval, 12×8mm, Blue) vs 4ct Emerald (Emerald, 11.56×8.56mm, Green)


Quick summary: When looked from above (face-up position), 4ct Emerald (11.56×8.56mm, emerald cut) appears 17% larger than 4ct Sapphire (12×8mm, oval cut). See below how they compare side-by-side on a ring and finger.

4ct Sapphire (oval cut)
vs
 4ct Emerald (emerald cut)
blue
 
green
12×8 mm 11.56×8.56 mm
actual size
Actual size of 4ct Sapphire (oval cut, 12×8mm, Blue color)   Actual size of 4ct Emerald (emerald cut, 11.56×8.56mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 4ct Sapphire (oval cut, 12×8mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 4ct Emerald (emerald cut, 11.56×8.56mm) 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
 48% vs 51%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Sapphire Oval (12×8mm, Blue) and 4ct Emerald Emerald (11.56×8.56mm, 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, Sapphire 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.


4 Ct Sapphire (Oval) 4 Ct Emerald (Emerald)
12×8 mm vs 11.56×8.56 mm
78.72 mm²   92.03 mm²
Face-up size outline for 4ct Emerald (11.56×8.56mm, emerald cut)
Face-up size outline for 4ct Sapphire (12×8mm, oval cut)
4ct Sapphire Oval (12×8mm)
4ct Emerald Emerald (11.56×8.56mm)
Difference: 17% (13.31 mm²)
4ct Emerald (Emerald, 11.56×8.56mm) has approx. 17% more face-up area than 4ct Sapphire (Oval, 12×8mm).


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