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10ct Diamond (Princess, 11.87×11.87mm, White) vs 6ct Sapphire (Princess, 9.77×9.77mm, Blue)


Quick summary: When looked from above (face-up position), 10ct Diamond (11.87×11.87mm, princess cut) appears 48% larger than 6ct Sapphire (9.77×9.77mm, princess cut). See below how they compare side-by-side on a ring and finger.

10ct Diamond (princess cut)
vs
 6ct Sapphire (princess cut)
white
 
blue
11.87×11.87 mm 9.77×9.77 mm
actual size
Actual size of 10ct Diamond (princess cut, 11.87×11.87mm, White color)   Actual size of 6ct Sapphire (princess cut, 9.77×9.77mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 10ct Diamond (princess cut, 11.87×11.87mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 6ct Sapphire (princess cut, 9.77×9.77mm) 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
 71% vs 58%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 10ct Diamond Princess (11.87×11.87mm, White) and 6ct Sapphire Princess (9.77×9.77mm, 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.


10 Ct Diamond (Princess) 6 Ct Sapphire (Princess)
11.87×11.87 mm vs 9.77×9.77 mm
140.9 mm²   95.45 mm²
Face-up size outline for 10ct Diamond (11.87×11.87mm, princess cut)
Face-up size outline for 6ct Sapphire (9.77×9.77mm, princess cut)
10ct Diamond Princess (11.87×11.87mm)
6ct Sapphire Princess (9.77×9.77mm)
Difference: 48% (45.45 mm²)
10ct Diamond (Princess, 11.87×11.87mm) has approx. 48% more face-up area than 6ct Sapphire (Princess, 9.77×9.77mm).


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