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1.8ct Sapphire (Marquise, 12×6mm, White) vs 1.8ct Diamond (Marquise, 12×6mm, White)


Quick summary: Compared gemstones have equal face-up area.

1.8ct Sapphire (marquise cut)
vs
1.8ct Diamond (marquise cut)
white
 
white
12×6 mm 12×6 mm
actual size
Actual size of 1.8ct Sapphire (marquise cut, 12×6mm, White color)   Actual size of 1.8ct Diamond (marquise cut, 12×6mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1.8ct Sapphire (marquise cut, 12×6mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1.8ct Diamond (marquise cut, 12×6mm) 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
36% vs 36%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.8ct Sapphire Marquise (12×6mm, White) and 1.8ct Diamond Marquise (12×6mm, 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.


1.8 Ct Sapphire (Marquise) 1.8 Ct Diamond (Marquise)
12×6 mm vs 12×6 mm
51.12 mm²   51.12 mm²
Face-up size outline for true size of 12×6mm
1.8ct Sapphire Marquise (12×6mm)
1.8ct Diamond Marquise (12×6mm)
Difference: 0% (0 mm²)
1.8ct Sapphire (Marquise, 12×6mm) and 1.8ct Diamond (Marquise, 12×6mm) have the same face-up area.


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