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1.5ct Sapphire (Marquise, 11.3×5.65mm, Blue) vs 1.5ct Alexandrite (Emerald, 7.51×5.56mm, Bluish Green)


Quick summary: When looked from above (face-up position), 1.5ct Sapphire (11.3×5.65mm, marquise cut) appears 17% larger than 1.5ct Alexandrite (7.51×5.56mm, emerald cut). See below how they compare side-by-side on a ring and finger.

1.5ct Sapphire (marquise cut)
vs
 1.5ct Alexandrite (emerald cut)
blue
 
bluish green
11.3×5.65 mm 7.51×5.56 mm
actual size
Actual size of 1.5ct Sapphire (marquise cut, 11.3×5.65mm, Blue color)   Actual size of 1.5ct Alexandrite (emerald cut, 7.51×5.56mm, Bluish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1.5ct Sapphire (marquise cut, 11.3×5.65mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 1.5ct Alexandrite (emerald cut, 7.51×5.56mm) 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
 34% vs 33%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.5ct Sapphire Marquise (11.3×5.65mm, Blue) and 1.5ct Alexandrite Emerald (7.51×5.56mm, Bluish Green) 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 Alexandrite for a given carat weight, because it has higher specific gravity (4 vs. 3.73 - this means it's "heavier" compared to Alexandrite 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.


1.5 Ct Sapphire (Marquise) 1.5 Ct Alexandrite (Emerald)
11.3×5.65 mm vs 7.51×5.56 mm
45.33 mm²   38.83 mm²
Face-up size outline for 1.5ct Sapphire (11.3×5.65mm, marquise cut)
Face-up size outline for 1.5ct Alexandrite (7.51×5.56mm, emerald cut)
1.5ct Sapphire Marquise (11.3×5.65mm)
1.5ct Alexandrite Emerald (7.51×5.56mm)
Difference: 17% (6.5 mm²)
1.5ct Sapphire (Marquise, 11.3×5.65mm) has approx. 17% more face-up area than 1.5ct Alexandrite (Emerald, 7.51×5.56mm).


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