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0.32ct Diamond (Round, 4.45×4.45mm, White) vs 0.78ct Topaz (Cushion, 5.37×5.37mm, Blue)


Quick summary: When looked from above (face-up position), 0.78ct Topaz (5.37×5.37mm, cushion cut) appears 67% larger than 0.32ct Diamond (4.45×4.45mm, round cut). See below how they compare side-by-side on a ring and finger.

0.32ct Diamond (round cut)
vs
 0.78ct Topaz (cushion cut)
white
 
blue
4.45×4.45 mm 5.37×5.37 mm
actual size
Actual size of 0.32ct Diamond (round cut, 4.45×4.45mm, White color)   Actual size of 0.78ct Topaz (cushion cut, 5.37×5.37mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.32ct Diamond (round cut, 4.45×4.45mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.78ct Topaz (cushion cut, 5.37×5.37mm) 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
 27% vs 32%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.32ct Diamond Round (4.45×4.45mm, White) and 0.78ct Topaz Cushion (5.37×5.37mm, Blue) 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, Topaz will face-up slightly smaller than Diamond for a given carat weight, because it has higher specific gravity (3.53 vs. 3.52 - this means it's "slightly 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.


0.32 Ct Diamond (Round) 0.78 Ct Topaz (Cushion)
4.45×4.45 mm vs 5.37×5.37 mm
15.55 mm²   25.95 mm²
Face-up size outline for 0.78ct Topaz (5.37×5.37mm, cushion cut)
Face-up size outline for 0.32ct Diamond (4.45×4.45mm, round cut)
0.32ct Diamond Round (4.45×4.45mm)
0.78ct Topaz Cushion (5.37×5.37mm)
Difference: 67% (10.4 mm²)
0.78ct Topaz (Cushion, 5.37×5.37mm) has approx. 67% more face-up area than 0.32ct Diamond (Round, 4.45×4.45mm).


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