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1.05ct Diamond (Oval, 8.25×5.5mm, White) vs 1ct Alexandrite (Trillion, 8.2×5.5mm, Bluish Green)


Quick summary: When looked from above (face-up position), 1.05ct Diamond (8.25×5.5mm, oval cut) appears 33% larger than 1ct Alexandrite (8.2×5.5mm, trillion cut). See below how they compare side-by-side on a ring and finger.

1.05ct Diamond (oval cut)
vs
 1ct Alexandrite (trillion cut)
white
 
bluish green
8.25×5.5 mm 8.2×5.5 mm
actual size
Actual size of 1.05ct Diamond (oval cut, 8.25×5.5mm, White color)   Actual size of 1ct Alexandrite (trillion cut, 8.2×5.5mm, Bluish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1.05ct Diamond (oval cut, 8.25×5.5mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 1ct Alexandrite (trillion cut, 8.2×5.5mm) 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
 33% vs 33%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.05ct Diamond Oval (8.25×5.5mm, White) and 1ct Alexandrite Trillion (8.2×5.5mm, 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 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.


1.05 Ct Diamond (Oval) 1 Ct Alexandrite (Trillion)
8.25×5.5 mm vs 8.2×5.5 mm
37.21 mm²   27.96 mm²
Face-up size outline for 1.05ct Diamond (8.25×5.5mm, oval cut)
Face-up size outline for 1ct Alexandrite (8.2×5.5mm, trillion cut)
1.05ct Diamond Oval (8.25×5.5mm)
1ct Alexandrite Trillion (8.2×5.5mm)
Difference: 33% (9.25 mm²)
1.05ct Diamond (Oval, 8.25×5.5mm) has approx. 33% more face-up area than 1ct Alexandrite (Trillion, 8.2×5.5mm).


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