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1.5ct Alexandrite (Marquise, 11.6×5.8mm, Bluish Green) vs 1.72ct Sapphire (Marquise, 11.82×5.91mm, Blue)


Quick summary: When looked from above (face-up position), 1.72ct Sapphire (11.82×5.91mm, marquise cut) appears 4% larger than 1.5ct Alexandrite (11.6×5.8mm, marquise cut). See below how they compare side-by-side on a ring and finger.

1.5ct Alexandrite (marquise cut)
vs
 1.72ct Sapphire (marquise cut)
bluish green
 
blue
11.6×5.8 mm 11.82×5.91 mm
actual size
Actual size of 1.5ct Alexandrite (marquise cut, 11.6×5.8mm, Bluish Green color)   Actual size of 1.72ct Sapphire (marquise cut, 11.82×5.91mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Bluish Green 1.5ct Alexandrite (marquise cut, 11.6×5.8mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1.72ct Sapphire (marquise cut, 11.82×5.91mm) 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
 35% vs 35%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 1.5ct Alexandrite Marquise (11.6×5.8mm, Bluish Green) and 1.72ct Sapphire Marquise (11.82×5.91mm, 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 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 Alexandrite (Marquise) 1.72 Ct Sapphire (Marquise)
11.6×5.8 mm vs 11.82×5.91 mm
47.77 mm²   49.6 mm²
Face-up size outline for 1.72ct Sapphire (11.82×5.91mm, marquise cut)
Face-up size outline for 1.5ct Alexandrite (11.6×5.8mm, marquise cut)
1.5ct Alexandrite Marquise (11.6×5.8mm)
1.72ct Sapphire Marquise (11.82×5.91mm)
Difference: 4% (1.83 mm²)
1.72ct Sapphire (Marquise, 11.82×5.91mm) has approx. 4% more face-up area than 1.5ct Alexandrite (Marquise, 11.6×5.8mm).


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