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9ct Emerald (Oval, 17.94×11.96mm, Green) vs 4ct Sapphire (Oval, 12×8mm, Blue)


Quick summary: When looked from above (face-up position), 9ct Emerald (17.94×11.96mm, oval cut) appears 2.2 times larger than 4ct Sapphire (12×8mm, oval cut). See below how they compare side-by-side on a ring and finger.

9ct Emerald (oval cut)
vs
 4ct Sapphire (oval cut)
green
 
blue
17.94×11.96 mm 12×8 mm
actual size
Actual size of 9ct Emerald (oval cut, 17.94×11.96mm, Green color)   Actual size of 4ct Sapphire (oval cut, 12×8mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Green 9ct Emerald (oval cut, 17.94×11.96mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 4ct Sapphire (oval cut, 12×8mm) 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
 71% vs 48%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 9ct Emerald Oval (17.94×11.96mm, Green) and 4ct Sapphire Oval (12×8mm, Blue) 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.


9 Ct Emerald (Oval) 4 Ct Sapphire (Oval)
17.94×11.96 mm vs 12×8 mm
175.94 mm²   78.72 mm²
Face-up size outline for 9ct Emerald (17.94×11.96mm, oval cut)
Face-up size outline for 4ct Sapphire (12×8mm, oval cut)
9ct Emerald Oval (17.94×11.96mm)
4ct Sapphire Oval (12×8mm)
Difference: 124% (97.22 mm²)
9ct Emerald (Oval, 17.94×11.96mm) has approx. 124% more face-up area than 4ct Sapphire (Oval, 12×8mm). In other words, it's 2.24x larger.


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