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9ct Diamond (Cushion, 12.12×12.12mm, White) vs 10ct Sapphire (Cushion, 12.05×12.05mm, Blue)


Quick summary: When looked from above (face-up position), 9ct Diamond (12.12×12.12mm, cushion cut) appears 1% larger than 10ct Sapphire (12.05×12.05mm, cushion cut). See below how they compare side-by-side on a ring and finger.

9ct Diamond (cushion cut)
vs
 10ct Sapphire (cushion cut)
white
 
blue
12.12×12.12 mm 12.05×12.05 mm
actual size
Actual size of 9ct Diamond (cushion cut, 12.12×12.12mm, White color)   Actual size of 10ct Sapphire (cushion cut, 12.05×12.05mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 9ct Diamond (cushion cut, 12.12×12.12mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 10ct Sapphire (cushion cut, 12.05×12.05mm) 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
 72% vs 72%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 9ct Diamond Cushion (12.12×12.12mm, White) and 10ct Sapphire Cushion (12.05×12.05mm, 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.


9 Ct Diamond (Cushion) 10 Ct Sapphire (Cushion)
12.12×12.12 mm vs 12.05×12.05 mm
132.2 mm²   130.68 mm²
Face-up size outline for 9ct Diamond (12.12×12.12mm, cushion cut)
Face-up size outline for 10ct Sapphire (12.05×12.05mm, cushion cut)
9ct Diamond Cushion (12.12×12.12mm)
10ct Sapphire Cushion (12.05×12.05mm)
Difference: 1% (1.52 mm²)
9ct Diamond (Cushion, 12.12×12.12mm) has approx. 1% more face-up area than 10ct Sapphire (Cushion, 12.05×12.05mm).


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