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1.25ct Alexandrite (Round, 6.59×6.59mm, Bluish Green) vs 1.25ct Diamond (Round, 7×7mm, White)


Quick summary: When looked from above (face-up position), 1.25ct Diamond (7×7mm, round cut) appears 13% larger than 1.25ct Alexandrite (6.59×6.59mm, round cut). See below how they compare side-by-side on a ring and finger.

1.25ct Alexandrite (round cut)
vs
 1.25ct Diamond (round cut)
bluish green
 
white
6.59×6.59 mm 7×7 mm
actual size
Actual size of 1.25ct Alexandrite (round cut, 6.59×6.59mm, Bluish Green color)   Actual size of 1.25ct Diamond (round cut, 7×7mm, 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 1.25ct Alexandrite (round cut, 6.59×6.59mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1.25ct Diamond (round cut, 7×7mm) 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
 39% vs 42%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.25ct Alexandrite Round (6.59×6.59mm, Bluish Green) and 1.25ct Diamond Round (7×7mm, 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.


1.25 Ct Alexandrite (Round) 1.25 Ct Diamond (Round)
6.59×6.59 mm vs 7×7 mm
34.11 mm²   38.48 mm²
Face-up size outline for 1.25ct Diamond (7×7mm, round cut)
Face-up size outline for 1.25ct Alexandrite (6.59×6.59mm, round cut)
1.25ct Alexandrite Round (6.59×6.59mm)
1.25ct Diamond Round (7×7mm)
Difference: 13% (4.37 mm²)
1.25ct Diamond (Round, 7×7mm) has approx. 13% more face-up area than 1.25ct Alexandrite (Round, 6.59×6.59mm).


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