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0.75ct Alexandrite (Marquise, 9.2×4.6mm, Purple) vs 2.5ct Diamond (Oval, 11.01×7.34mm, White)


Quick summary: When looked from above (face-up position), 2.5ct Diamond (11.01×7.34mm, oval cut) appears 2.2 times larger than 0.75ct Alexandrite (9.2×4.6mm, marquise cut). See below how they compare side-by-side on a ring and finger.

0.75ct Alexandrite (marquise cut)
vs
 2.5ct Diamond (oval cut)
purple
 
white
9.2×4.6 mm 11.01×7.34 mm
actual size
Actual size of 0.75ct Alexandrite (marquise cut, 9.2×4.6mm, Purple color)   Actual size of 2.5ct Diamond (oval cut, 11.01×7.34mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Purple 0.75ct Alexandrite (marquise cut, 9.2×4.6mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 2.5ct Diamond (oval cut, 11.01×7.34mm) 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 44%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.75ct Alexandrite Marquise (9.2×4.6mm, Purple) and 2.5ct Diamond Oval (11.01×7.34mm, 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.


0.75 Ct Alexandrite (Marquise) 2.5 Ct Diamond (Oval)
9.2×4.6 mm vs 11.01×7.34 mm
30.05 mm²   66.27 mm²
Face-up size outline for 2.5ct Diamond (11.01×7.34mm, oval cut)
Face-up size outline for 0.75ct Alexandrite (9.2×4.6mm, marquise cut)
0.75ct Alexandrite Marquise (9.2×4.6mm)
2.5ct Diamond Oval (11.01×7.34mm)
Difference: 121% (36.22 mm²)
2.5ct Diamond (Oval, 11.01×7.34mm) has approx. 121% more face-up area than 0.75ct Alexandrite (Marquise, 9.2×4.6mm). In other words, it's 2.21x larger.


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