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1.25ct Alexandrite (Radiant, 6.07×6.07mm, Bluish Green) vs 1.25ct Diamond (Radiant, 6.22×6.22mm, White)


Quick summary: When looked from above (face-up position), 1.25ct Diamond (6.22×6.22mm, radiant cut) appears 5% larger than 1.25ct Alexandrite (6.07×6.07mm, radiant cut). See below how they compare side-by-side on a ring and finger.

1.25ct Alexandrite (radiant cut)
vs
 1.25ct Diamond (radiant cut)
bluish green
 
white
6.07×6.07 mm 6.22×6.22 mm
actual size
Actual size of 1.25ct Alexandrite (radiant cut, 6.07×6.07mm, Bluish Green color)   Actual size of 1.25ct Diamond (radiant cut, 6.22×6.22mm, 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 (radiant cut, 6.07×6.07mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1.25ct Diamond (radiant cut, 6.22×6.22mm) 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
 36% vs 37%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.25ct Alexandrite Radiant (6.07×6.07mm, Bluish Green) and 1.25ct Diamond Radiant (6.22×6.22mm, 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 (Radiant) 1.25 Ct Diamond (Radiant)
6.07×6.07 mm vs 6.22×6.22 mm
35 mm²   36.75 mm²
Face-up size outline for 1.25ct Diamond (6.22×6.22mm, radiant cut)
Face-up size outline for 1.25ct Alexandrite (6.07×6.07mm, radiant cut)
1.25ct Alexandrite Radiant (6.07×6.07mm)
1.25ct Diamond Radiant (6.22×6.22mm)
Difference: 5% (1.75 mm²)
1.25ct Diamond (Radiant, 6.22×6.22mm) has approx. 5% more face-up area than 1.25ct Alexandrite (Radiant, 6.07×6.07mm).


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