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0.8ct Sapphire (Oval, 7.02×4.68mm, Blue) vs 1ct Alexandrite (Round, 6×6mm, Dark Purple)


Quick summary: When looked from above (face-up position), 1ct Alexandrite (6×6mm, round cut) appears 5% larger than 0.8ct Sapphire (7.02×4.68mm, oval cut). See below how they compare side-by-side on a ring and finger.

0.8ct Sapphire (oval cut)
vs
 1ct Alexandrite (round cut)
blue
 
dark purple
7.02×4.68 mm 6×6 mm
actual size
Actual size of 0.8ct Sapphire (oval cut, 7.02×4.68mm, Blue color)   Actual size of 1ct Alexandrite (round cut, 6×6mm, Dark Purple color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 0.8ct Sapphire (oval cut, 7.02×4.68mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Purple 1ct Alexandrite (round cut, 6×6mm) 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
 28% vs 36%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.8ct Sapphire Oval (7.02×4.68mm, Blue) and 1ct Alexandrite Round (6×6mm, Dark Purple) 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.


0.8 Ct Sapphire (Oval) 1 Ct Alexandrite (Round)
7.02×4.68 mm vs 6×6 mm
26.94 mm²   28.27 mm²
Face-up size outline for 1ct Alexandrite (6×6mm, round cut)
Face-up size outline for 0.8ct Sapphire (7.02×4.68mm, oval cut)
0.8ct Sapphire Oval (7.02×4.68mm)
1ct Alexandrite Round (6×6mm)
Difference: 5% (1.33 mm²)
1ct Alexandrite (Round, 6×6mm) has approx. 5% more face-up area than 0.8ct Sapphire (Oval, 7.02×4.68mm).


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