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0.51ct Diamond (Oval, 6.48×4.32mm, White) vs 1ct Sapphire (Oval, 7×5mm, Dark Bluish Green)


Quick summary: When looked from above (face-up position), 1ct Sapphire (7×5mm, oval cut) appears 25% larger than 0.51ct Diamond (6.48×4.32mm, oval cut). See below how they compare side-by-side on a ring and finger.

0.51ct Diamond (oval cut)
vs
 1ct Sapphire (oval cut)
white
 
dark bluish green
6.48×4.32 mm 7×5 mm
actual size
Actual size of 0.51ct Diamond (oval cut, 6.48×4.32mm, White color)   Actual size of 1ct Sapphire (oval cut, 7×5mm, 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
White 0.51ct Diamond (oval cut, 6.48×4.32mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Bluish Green 1ct Sapphire (oval cut, 7×5mm) 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
 26% vs 30%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.51ct Diamond Oval (6.48×4.32mm, White) and 1ct Sapphire Oval (7×5mm, 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.


0.51 Ct Diamond (Oval) 1 Ct Sapphire (Oval)
6.48×4.32 mm vs 7×5 mm
22.95 mm²   28.7 mm²
Face-up size outline for 1ct Sapphire (7×5mm, oval cut)
Face-up size outline for 0.51ct Diamond (6.48×4.32mm, oval cut)
0.51ct Diamond Oval (6.48×4.32mm)
1ct Sapphire Oval (7×5mm)
Difference: 25% (5.75 mm²)
1ct Sapphire (Oval, 7×5mm) has approx. 25% more face-up area than 0.51ct Diamond (Oval, 6.48×4.32mm).


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