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0.25ct Alexandrite (Oval, 4.95×3.3mm, Bluish Green) vs 0.25ct Diamond (Oval, 5.12×3.41mm, White)


Quick summary: When looked from above (face-up position), 0.25ct Diamond (5.12×3.41mm, oval cut) appears 7% larger than 0.25ct Alexandrite (4.95×3.3mm, oval cut). See below how they compare side-by-side on a ring and finger.

0.25ct Alexandrite (oval cut)
vs
 0.25ct Diamond (oval cut)
bluish green
 
white
4.95×3.3 mm 5.12×3.41 mm
actual size
Actual size of 0.25ct Alexandrite (oval cut, 4.95×3.3mm, Bluish Green color)   Actual size of 0.25ct Diamond (oval cut, 5.12×3.41mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Bluish Green 0.25ct Alexandrite (oval cut, 4.95×3.3mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.25ct Diamond (oval cut, 5.12×3.41mm) 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
Finger coverage
 20% vs 21%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.25ct Alexandrite Oval (4.95×3.3mm, Bluish Green) and 0.25ct Diamond Oval (5.12×3.41mm, White) 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 (3.73 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.


0.25 Ct Alexandrite (Oval) 0.25 Ct Diamond (Oval)
4.95×3.3 mm vs 5.12×3.41 mm
13.39 mm²   14.32 mm²
Face-up size outline for 0.25ct Diamond (5.12×3.41mm, oval cut)
Face-up size outline for 0.25ct Alexandrite (4.95×3.3mm, oval cut)
0.25ct Alexandrite Oval (4.95×3.3mm)
0.25ct Diamond Oval (5.12×3.41mm)
Difference: 7% (0.93 mm²)
0.25ct Diamond (Oval, 5.12×3.41mm) has approx. 7% more face-up area than 0.25ct Alexandrite (Oval, 4.95×3.3mm).


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