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1.35ct Sapphire (Round, 6.61×6.61mm, Dark Bluish Green) vs 1ct Diamond (Round, 6.5×6.5mm, Dark Bluish Green)


Quick summary: When looked from above (face-up position), 1.35ct Sapphire (6.61×6.61mm, round cut) appears 3% larger than 1ct Colored Diamond (6.5×6.5mm, round cut). See below how they compare side-by-side on a ring and finger.

1.35ct Sapphire (round cut)
vs
 1ct Diamond (round cut)
dark bluish green
 
dark bluish green
6.61×6.61 mm 6.5×6.5 mm
actual size
Actual size of 1.35ct Sapphire (round cut, 6.61×6.61mm, Dark Bluish Green color)   Actual size of 1ct Diamond (round cut, 6.5×6.5mm, Dark Bluish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Dark Bluish Green 1.35ct Sapphire (round cut, 6.61×6.61mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Bluish Green 1ct Diamond (round cut, 6.5×6.5mm) 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 39%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 1.35ct Sapphire Round (6.61×6.61mm, Dark Bluish Green) and 1ct Diamond Round (6.5×6.5mm, Dark Bluish Green) 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.


1.35 Ct Sapphire (Round) 1 Ct Colored Diamond (Round)
6.61×6.61 mm vs 6.5×6.5 mm
34.32 mm²   33.18 mm²
Face-up size outline for 1.35ct Sapphire (6.61×6.61mm, round cut)
Face-up size outline for 1ct Diamond (6.5×6.5mm, round cut)
1.35ct Sapphire Round (6.61×6.61mm)
1ct Colored Diamond Round (6.5×6.5mm)
Difference: 3% (1.14 mm²)
1.35ct Sapphire (Round, 6.61×6.61mm) has approx. 3% more face-up area than 1ct Colored Diamond (Round, 6.5×6.5mm).


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