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1.55ct Sapphire (Oval, 8×6mm, Blue) vs 1.55ct Diamond (Oval, 9.39×6.26mm, White)


Quick summary: When looked from above (face-up position), 1.55ct Diamond (9.39×6.26mm, oval cut) appears 22% larger than 1.55ct Sapphire (8×6mm, oval cut). See below how they compare side-by-side on a ring and finger.

1.55ct Sapphire (oval cut)
vs
 1.55ct Diamond (oval cut)
blue
 
white
8×6 mm 9.39×6.26 mm
actual size
Actual size of 1.55ct Sapphire (oval cut, 8×6mm, Blue color)   Actual size of 1.55ct Diamond (oval cut, 9.39×6.26mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1.55ct Sapphire (oval cut, 8×6mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1.55ct Diamond (oval cut, 9.39×6.26mm) 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
 36% vs 38%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.55ct Sapphire Oval (8×6mm, Blue) and 1.55ct Diamond Oval (9.39×6.26mm, White) 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.


1.55 Ct Sapphire (Oval) 1.55 Ct Diamond (Oval)
8×6 mm vs 9.39×6.26 mm
39.36 mm²   48.2 mm²
Face-up size outline for 1.55ct Diamond (9.39×6.26mm, oval cut)
Face-up size outline for 1.55ct Sapphire (8×6mm, oval cut)
1.55ct Sapphire Oval (8×6mm)
1.55ct Diamond Oval (9.39×6.26mm)
Difference: 22% (8.84 mm²)
1.55ct Diamond (Oval, 9.39×6.26mm) has approx. 22% more face-up area than 1.55ct Sapphire (Oval, 8×6mm).


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