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1ct Diamond (Round, 6.6×6.6mm, White) vs 2ct Sapphire (Round, 7.53×7.53mm, Blue)


Quick summary: When looked from above (face-up position), 2ct Sapphire (7.53×7.53mm, round cut) appears 30% larger than 1ct Diamond (6.6×6.6mm, round cut). See below how they compare side-by-side on a ring and finger.

1ct Diamond (round cut)
vs
 2ct Sapphire (round cut)
white
 
blue
6.6×6.6 mm 7.53×7.53 mm
actual size
Actual size of 1ct Diamond (round cut, 6.6×6.6mm, White color)   Actual size of 2ct Sapphire (round cut, 7.53×7.53mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1ct Diamond (round cut, 6.6×6.6mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 2ct Sapphire (round cut, 7.53×7.53mm) 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
 40% vs 45%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Diamond Round (6.6×6.6mm, White) and 2ct Sapphire Round (7.53×7.53mm, 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.


1 Ct Diamond (Round) 2 Ct Sapphire (Round)
6.6×6.6 mm vs 7.53×7.53 mm
34.21 mm²   44.53 mm²
Face-up size outline for 2ct Sapphire (7.53×7.53mm, round cut)
Face-up size outline for 1ct Diamond (6.6×6.6mm, round cut)
1ct Diamond Round (6.6×6.6mm)
2ct Sapphire Round (7.53×7.53mm)
Difference: 30% (10.32 mm²)
2ct Sapphire (Round, 7.53×7.53mm) has approx. 30% more face-up area than 1ct Diamond (Round, 6.6×6.6mm).


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