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1.6ct Diamond (Princess, 6.45×6.45mm, White) vs 1.2ct Sapphire (Oval, 8.04×5.36mm, Blue)


Quick summary: When looked from above (face-up position), 1.6ct Diamond (6.45×6.45mm, princess cut) appears 18% larger than 1.2ct Sapphire (8.04×5.36mm, oval cut). See below how they compare side-by-side on a ring and finger.

1.6ct Diamond (princess cut)
vs
 1.2ct Sapphire (oval cut)
white
 
blue
6.45×6.45 mm 8.04×5.36 mm
actual size
Actual size of 1.6ct Diamond (princess cut, 6.45×6.45mm, White color)   Actual size of 1.2ct Sapphire (oval cut, 8.04×5.36mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1.6ct Diamond (princess cut, 6.45×6.45mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1.2ct Sapphire (oval cut, 8.04×5.36mm) 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
 39% vs 32%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.6ct Diamond Princess (6.45×6.45mm, White) and 1.2ct Sapphire Oval (8.04×5.36mm, 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.


1.6 Ct Diamond (Princess) 1.2 Ct Sapphire (Oval)
6.45×6.45 mm vs 8.04×5.36 mm
41.6 mm²   35.34 mm²
Face-up size outline for 1.6ct Diamond (6.45×6.45mm, princess cut)
Face-up size outline for 1.2ct Sapphire (8.04×5.36mm, oval cut)
1.6ct Diamond Princess (6.45×6.45mm)
1.2ct Sapphire Oval (8.04×5.36mm)
Difference: 18% (6.26 mm²)
1.6ct Diamond (Princess, 6.45×6.45mm) has approx. 18% more face-up area than 1.2ct Sapphire (Oval, 8.04×5.36mm).


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