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3ct Sapphire (Round, 8.62×8.62mm, Blue) vs 2ct Diamond (Oval, 10.23×6.82mm, White)


Quick summary: When looked from above (face-up position), 3ct Sapphire (8.62×8.62mm, round cut) appears 2% larger than 2ct Diamond (10.23×6.82mm, oval cut). See below how they compare side-by-side on a ring and finger.

3ct Sapphire (round cut)
vs
 2ct Diamond (oval cut)
blue
 
white
8.62×8.62 mm 10.23×6.82 mm
actual size
Actual size of 3ct Sapphire (round cut, 8.62×8.62mm, Blue color)   Actual size of 2ct Diamond (oval cut, 10.23×6.82mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 3ct Sapphire (round cut, 8.62×8.62mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 2ct Diamond (oval cut, 10.23×6.82mm) 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
 52% vs 41%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3ct Sapphire Round (8.62×8.62mm, Blue) and 2ct Diamond Oval (10.23×6.82mm, 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, Sapphire will face-up smaller than Diamond for a given carat weight, because it has higher specific gravity (4 vs. 3.52 - this means it's "heavier" compared to Diamond 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.


3 Ct Sapphire (Round) 2 Ct Diamond (Oval)
8.62×8.62 mm vs 10.23×6.82 mm
58.36 mm²   57.21 mm²
Face-up size outline for 3ct Sapphire (8.62×8.62mm, round cut)
Face-up size outline for 2ct Diamond (10.23×6.82mm, oval cut)
3ct Sapphire Round (8.62×8.62mm)
2ct Diamond Oval (10.23×6.82mm)
Difference: 2% (1.15 mm²)
3ct Sapphire (Round, 8.62×8.62mm) has approx. 2% more face-up area than 2ct Diamond (Oval, 10.23×6.82mm).


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