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0.75ct Alexandrite (Trillion, 6.55×6.55mm, Bluish Green) vs 0.87ct Diamond (Round, 6.21×6.21mm, White)


Quick summary: When looked from above (face-up position), 0.87ct Diamond (6.21×6.21mm, round cut) appears 14% larger than 0.75ct Alexandrite (6.55×6.55mm, trillion cut). See below how they compare side-by-side on a ring and finger.

0.75ct Alexandrite (trillion cut)
vs
 0.87ct Diamond (round cut)
bluish green
 
white
6.55×6.55 mm 6.21×6.21 mm
actual size
Actual size of 0.75ct Alexandrite (trillion cut, 6.55×6.55mm, Bluish Green color)   Actual size of 0.87ct Diamond (round cut, 6.21×6.21mm, 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 0.75ct Alexandrite (trillion cut, 6.55×6.55mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.87ct Diamond (round cut, 6.21×6.21mm) 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 37%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.75ct Alexandrite Trillion (6.55×6.55mm, Bluish Green) and 0.87ct Diamond Round (6.21×6.21mm, 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.


0.75 Ct Alexandrite (Trillion) 0.87 Ct Diamond (Round)
6.55×6.55 mm vs 6.21×6.21 mm
26.6 mm²   30.29 mm²
Face-up size outline for 0.87ct Diamond (6.21×6.21mm, round cut)
Face-up size outline for 0.75ct Alexandrite (6.55×6.55mm, trillion cut)
0.75ct Alexandrite Trillion (6.55×6.55mm)
0.87ct Diamond Round (6.21×6.21mm)
Difference: 14% (3.69 mm²)
0.87ct Diamond (Round, 6.21×6.21mm) has approx. 14% more face-up area than 0.75ct Alexandrite (Trillion, 6.55×6.55mm).


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