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0.7ct Alexandrite (Cushion, 5×5mm, Bluish Green) vs 0.7ct Topaz (Round, 6×6mm, Bluish Green)


Quick summary: When looked from above (face-up position), 0.7ct Topaz (6×6mm, round cut) appears 26% larger than 0.7ct Alexandrite (5×5mm, cushion cut). See below how they compare side-by-side on a ring and finger.

0.7ct Alexandrite (cushion cut)
vs
 0.7ct Topaz (round cut)
bluish green
 
bluish green
5×5 mm 6×6 mm
actual size
Actual size of 0.7ct Alexandrite (cushion cut, 5×5mm, Bluish Green color)   Actual size of 0.7ct Topaz (round cut, 6×6mm, 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 0.7ct Alexandrite (cushion cut, 5×5mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 0.7ct Topaz (round cut, 6×6mm) 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
 30% vs 36%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.7ct Alexandrite Cushion (5×5mm, Bluish Green) and 0.7ct Topaz Round (6×6mm, 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 Topaz for a given carat weight, because it has higher specific gravity (3.73 vs. 3.53 - this means it's "heavier" compared to Topaz 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.


0.7 Ct Alexandrite (Cushion) 0.7 Ct Topaz (Round)
5×5 mm vs 6×6 mm
22.5 mm²   28.27 mm²
Face-up size outline for 0.7ct Topaz (6×6mm, round cut)
Face-up size outline for 0.7ct Alexandrite (5×5mm, cushion cut)
0.7ct Alexandrite Cushion (5×5mm)
0.7ct Topaz Round (6×6mm)
Difference: 26% (5.77 mm²)
0.7ct Topaz (Round, 6×6mm) has approx. 26% more face-up area than 0.7ct Alexandrite (Cushion, 5×5mm).


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