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1.25ct Sapphire (Oval, 8.15×5.43mm, Dark Bluish Green) vs 1.25ct Diamond (Oval, 8.75×5.83mm, Dark Bluish Green)


Quick summary: When looked from above (face-up position), 1.25ct Colored Diamond (8.75×5.83mm, oval cut) appears 15% larger than 1.25ct Sapphire (8.15×5.43mm, oval cut). See below how they compare side-by-side on a ring and finger.

1.25ct Sapphire (oval cut)
vs
 1.25ct Diamond (oval cut)
dark bluish green
 
dark bluish green
8.15×5.43 mm 8.75×5.83 mm
actual size
Actual size of 1.25ct Sapphire (oval cut, 8.15×5.43mm, Dark Bluish Green color)   Actual size of 1.25ct Diamond (oval cut, 8.75×5.83mm, 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 1.25ct Sapphire (oval cut, 8.15×5.43mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Bluish Green 1.25ct Diamond (oval cut, 8.75×5.83mm) 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
 33% vs 35%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 1.25ct Sapphire Oval (8.15×5.43mm, Dark Bluish Green) and 1.25ct Diamond Oval (8.75×5.83mm, 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.


1.25 Ct Sapphire (Oval) 1.25 Ct Colored Diamond (Oval)
8.15×5.43 mm vs 8.75×5.83 mm
36.29 mm²   41.83 mm²
Face-up size outline for 1.25ct Diamond (8.75×5.83mm, oval cut)
Face-up size outline for 1.25ct Sapphire (8.15×5.43mm, oval cut)
1.25ct Sapphire Oval (8.15×5.43mm)
1.25ct Colored Diamond Oval (8.75×5.83mm)
Difference: 15% (5.54 mm²)
1.25ct Colored Diamond (Oval, 8.75×5.83mm) has approx. 15% more face-up area than 1.25ct Sapphire (Oval, 8.15×5.43mm).


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