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0.9ct Diamond (Princess, 5.32×5.32mm, White) vs 1ct Alexandrite (Oval, 6.44×5.41mm, Bluish Green)


Quick summary: When looked from above (face-up position), 1ct Alexandrite (6.44×5.41mm, oval cut) appears 1% larger than 0.9ct Diamond (5.32×5.32mm, princess cut). See below how they compare side-by-side on a ring and finger.

0.9ct Diamond (princess cut)
vs
1ct Alexandrite (oval cut)
white
 
bluish green
5.32×5.32 mm 6.44×5.41 mm
actual size
Actual size of 0.9ct Diamond (princess cut, 5.32×5.32mm, White color)   Actual size of 1ct Alexandrite (oval cut, 6.44×5.41mm, Bluish Green color)
 
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Ring: Skin tone:
Ring width: 3.0 mm
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Left finger image
Ring on left finger
White 0.9ct Diamond (princess cut, 5.32×5.32mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 1ct Alexandrite (oval cut, 6.44×5.41mm) 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
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Ring diameter: 16.9 mm
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Actual sizes of 0.9ct Diamond Princess (5.32×5.32mm, White) and 1ct Alexandrite Oval (6.44×5.41mm, 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, Alexandrite will face-up smaller than Diamond for a given carat weight, because it has higher specific gravity (3.7 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.


0.9 Ct Diamond (Princess) 1 Ct Alexandrite (Oval)
5.32×5.32 mm vs 6.44×5.41 mm
28.3 mm²   28.57 mm²
Face-up size outline for 1ct Alexandrite (6.44×5.41mm, oval cut)
Face-up size outline for 0.9ct Diamond (5.32×5.32mm, princess cut)
0.9ct Diamond Princess (5.32×5.32mm)
1ct Alexandrite Oval (6.44×5.41mm)
Difference: 1% (0.27 mm²)
1ct Alexandrite Oval (6.44×5.41mm) has approx. 1% more face-up area than 0.9ct Diamond Princess (5.32×5.32mm).


Popular comparisons:

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