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4ct Alexandrite (Oval, 12.47×8.31mm, Bluish Green) vs 4ct Sapphire (Oval, 12.17×8.11mm, Blue)


Quick summary: When looked from above (face-up position), 4ct Alexandrite (12.47×8.31mm, oval cut) appears 5% larger than 4ct Sapphire (12.17×8.11mm, oval cut). See below how they compare side-by-side on a ring and finger.

4ct Alexandrite (oval cut)
vs
 4ct Sapphire (oval cut)
bluish green
 
blue
12.47×8.31 mm 12.17×8.11 mm
actual size
Actual size of 4ct Alexandrite (oval cut, 12.47×8.31mm, Bluish Green color)   Actual size of 4ct Sapphire (oval cut, 12.17×8.11mm, 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 4ct Alexandrite (oval cut, 12.47×8.31mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 4ct Sapphire (oval cut, 12.17×8.11mm) 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
 50% vs 48%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Alexandrite Oval (12.47×8.31mm, Bluish Green) and 4ct Sapphire Oval (12.17×8.11mm, 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.


4 Ct Alexandrite (Oval) 4 Ct Sapphire (Oval)
12.47×8.31 mm vs 12.17×8.11 mm
84.97 mm²   80.93 mm²
Face-up size outline for 4ct Alexandrite (12.47×8.31mm, oval cut)
Face-up size outline for 4ct Sapphire (12.17×8.11mm, oval cut)
4ct Alexandrite Oval (12.47×8.31mm)
4ct Sapphire Oval (12.17×8.11mm)
Difference: 5% (4.04 mm²)
4ct Alexandrite (Oval, 12.47×8.31mm) has approx. 5% more face-up area than 4ct Sapphire (Oval, 12.17×8.11mm).


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