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9ct Sapphire (Emerald, 13.28×9.84mm, Blue) vs 7ct Diamond (Emerald, 12.78×9.47mm, White)


Quick summary: When looked from above (face-up position), 9ct Sapphire (13.28×9.84mm, emerald cut) appears 8% larger than 7ct Diamond (12.78×9.47mm, emerald cut). See below how they compare side-by-side on a ring and finger.

9ct Sapphire (emerald cut)
vs
 7ct Diamond (emerald cut)
blue
 
white
13.28×9.84 mm 12.78×9.47 mm
actual size
Actual size of 9ct Sapphire (emerald cut, 13.28×9.84mm, Blue color)   Actual size of 7ct Diamond (emerald cut, 12.78×9.47mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 9ct Sapphire (emerald cut, 13.28×9.84mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 7ct Diamond (emerald cut, 12.78×9.47mm) 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
 59% vs 57%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 9ct Sapphire Emerald (13.28×9.84mm, Blue) and 7ct Diamond Emerald (12.78×9.47mm, 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.


9 Ct Sapphire (Emerald) 7 Ct Diamond (Emerald)
13.28×9.84 mm vs 12.78×9.47 mm
121.53 mm²   112.55 mm²
Face-up size outline for 9ct Sapphire (13.28×9.84mm, emerald cut)
Face-up size outline for 7ct Diamond (12.78×9.47mm, emerald cut)
9ct Sapphire Emerald (13.28×9.84mm)
7ct Diamond Emerald (12.78×9.47mm)
Difference: 8% (8.98 mm²)
9ct Sapphire (Emerald, 13.28×9.84mm) has approx. 8% more face-up area than 7ct Diamond (Emerald, 12.78×9.47mm).


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