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3ct Diamond (Round, 9.37×9.37mm, Black) vs 1.2ct Sapphire (Oval, 8×6mm, Blue)


Quick summary: When looked from above (face-up position), 3ct Colored Diamond (9.37×9.37mm, round cut) appears 75% larger than 1.2ct Sapphire (8×6mm, oval cut). See below how they compare side-by-side on a ring and finger.

3ct Diamond (round cut)
vs
 1.2ct Sapphire (oval cut)
black
 
blue
9.37×9.37 mm 8×6 mm
actual size
Actual size of 3ct Diamond (round cut, 9.37×9.37mm, Black color)   Actual size of 1.2ct Sapphire (oval cut, 8×6mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Black 3ct Diamond (round cut, 9.37×9.37mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1.2ct Sapphire (oval cut, 8×6mm) 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
 56% vs 36%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3ct Diamond Round (9.37×9.37mm, Black) and 1.2ct Sapphire Oval (8×6mm, 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 Colored Diamond (Round) 1.2 Ct Sapphire (Oval)
9.37×9.37 mm vs 8×6 mm
68.96 mm²   39.36 mm²
Face-up size outline for 3ct Diamond (9.37×9.37mm, round cut)
Face-up size outline for 1.2ct Sapphire (8×6mm, oval cut)
3ct Colored Diamond Round (9.37×9.37mm)
1.2ct Sapphire Oval (8×6mm)
Difference: 75% (29.6 mm²)
3ct Colored Diamond (Round, 9.37×9.37mm) has approx. 75% more face-up area than 1.2ct Sapphire (Oval, 8×6mm).


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