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3ct Diamond (Cushion, 8.4×8.4mm, White) vs 2ct Sapphire (Oval, 9.53×6.35mm, Blue)


Quick summary: When looked from above (face-up position), 3ct Diamond (8.4×8.4mm, cushion cut) appears 28% larger than 2ct Sapphire (9.53×6.35mm, oval cut). See below how they compare side-by-side on a ring and finger.

3ct Diamond (cushion cut)
vs
 2ct Sapphire (oval cut)
white
 
blue
8.4×8.4 mm 9.53×6.35 mm
actual size
Actual size of 3ct Diamond (cushion cut, 8.4×8.4mm, White color)   Actual size of 2ct Sapphire (oval cut, 9.53×6.35mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 3ct Diamond (cushion cut, 8.4×8.4mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 2ct Sapphire (oval cut, 9.53×6.35mm) 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
 50% vs 38%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3ct Diamond Cushion (8.4×8.4mm, White) and 2ct Sapphire Oval (9.53×6.35mm, 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 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 Diamond (Cushion) 2 Ct Sapphire (Oval)
8.4×8.4 mm vs 9.53×6.35 mm
63.5 mm²   49.62 mm²
Face-up size outline for 3ct Diamond (8.4×8.4mm, cushion cut)
Face-up size outline for 2ct Sapphire (9.53×6.35mm, oval cut)
3ct Diamond Cushion (8.4×8.4mm)
2ct Sapphire Oval (9.53×6.35mm)
Difference: 28% (13.88 mm²)
3ct Diamond (Cushion, 8.4×8.4mm) has approx. 28% more face-up area than 2ct Sapphire (Oval, 9.53×6.35mm).


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