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0.5ct Fluorite (Cabochon, 5.87×3.91mm, Bluish Green) vs 0.5ct Alexandrite (Cabochon, 5.57×3.71mm, Bluish Green)


Quick summary: When looked from above (face-up position), 0.5ct Fluorite (5.87×3.91mm, cabochon cut) appears 11% larger than 0.5ct Alexandrite (5.57×3.71mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

0.5ct Fluorite (cabochon cut)
vs
 0.5ct Alexandrite (cabochon cut)
bluish green
 
bluish green
5.87×3.91 mm 5.57×3.71 mm
actual size
Actual size of 0.5ct Fluorite (cabochon cut, 5.87×3.91mm, Bluish Green color)   Actual size of 0.5ct Alexandrite (cabochon cut, 5.57×3.71mm, Bluish Green color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Bluish Green 0.5ct Fluorite (cabochon cut, 5.87×3.91mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 0.5ct Alexandrite (cabochon cut, 5.57×3.71mm) 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
 24% vs 22%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.5ct Fluorite Cabochon (5.87×3.91mm, Bluish Green) and 0.5ct Alexandrite Cabochon (5.57×3.71mm, 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 Fluorite for a given carat weight, because it has higher specific gravity (3.73 vs. 3.18 - this means it's "heavier" compared to Fluorite 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.


0.5 Ct Fluorite (Cabochon) 0.5 Ct Alexandrite (Cabochon)
5.87×3.91 mm vs 5.57×3.71 mm
18.82 mm²   16.95 mm²
Face-up size outline for 0.5ct Fluorite (5.87×3.91mm, cabochon cut)
Face-up size outline for 0.5ct Alexandrite (5.57×3.71mm, cabochon cut)
0.5ct Fluorite Cabochon (5.87×3.91mm)
0.5ct Alexandrite Cabochon (5.57×3.71mm)
Difference: 11% (1.87 mm²)
0.5ct Fluorite (Cabochon, 5.87×3.91mm) has approx. 11% more face-up area than 0.5ct Alexandrite (Cabochon, 5.57×3.71mm).


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