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28ct Benitoite (Round, 18.72×18.72mm, Blue) vs 28ct Alexandrite (Round, 18.58×18.58mm, Bluish Green)


Quick summary: When looked from above (face-up position), 28ct Benitoite (18.72×18.72mm, round cut) appears 2% larger than 28ct Alexandrite (18.58×18.58mm, round cut). See below how they compare side-by-side on a ring and finger.

28ct Benitoite (round cut)
vs
 28ct Alexandrite (round cut)
blue
 
bluish green
18.72×18.72 mm 18.58×18.58 mm
actual size
Actual size of 28ct Benitoite (round cut, 18.72×18.72mm, Blue color)   Actual size of 28ct Alexandrite (round cut, 18.58×18.58mm, Bluish Green color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 28ct Benitoite (round cut, 18.72×18.72mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 28ct Alexandrite (round cut, 18.58×18.58mm) 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
 111% vs 110%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 28ct Benitoite Round (18.72×18.72mm, Blue) and 28ct Alexandrite Round (18.58×18.58mm, 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 slightly smaller than Benitoite for a given carat weight, because it has higher specific gravity (3.73 vs. 3.65 - this means it's "slightly heavier" compared to Benitoite 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.


28 Ct Benitoite (Round) 28 Ct Alexandrite (Round)
18.72×18.72 mm vs 18.58×18.58 mm
275.23 mm²   271.13 mm²
Face-up size outline for 28ct Benitoite (18.72×18.72mm, round cut)
Face-up size outline for 28ct Alexandrite (18.58×18.58mm, round cut)
28ct Benitoite Round (18.72×18.72mm)
28ct Alexandrite Round (18.58×18.58mm)
Difference: 2% (4.1 mm²)
28ct Benitoite (Round, 18.72×18.72mm) has approx. 2% more face-up area than 28ct Alexandrite (Round, 18.58×18.58mm).


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