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0.25ct Diamond (Princess, 3.47×3.47mm, White) vs 1.5ct Topaz (Round, 7.13×7.13mm, Light Blue)


Quick summary: When looked from above (face-up position), 1.5ct Topaz (7.13×7.13mm, round cut) appears 3.3 times larger than 0.25ct Diamond (3.47×3.47mm, princess cut). See below how they compare side-by-side on a ring and finger.

0.25ct Diamond (princess cut)
vs
 1.5ct Topaz (round cut)
white
 
light blue
3.47×3.47 mm 7.13×7.13 mm
actual size
Actual size of 0.25ct Diamond (princess cut, 3.47×3.47mm, White color)   Actual size of 1.5ct Topaz (round cut, 7.13×7.13mm, Light Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.25ct Diamond (princess cut, 3.47×3.47mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Blue 1.5ct Topaz (round cut, 7.13×7.13mm) 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
 21% vs 43%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.25ct Diamond Princess (3.47×3.47mm, White) and 1.5ct Topaz Round (7.13×7.13mm, Light 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.


0.25 Ct Diamond (Princess) 1.5 Ct Topaz (Round)
3.47×3.47 mm vs 7.13×7.13 mm
12.04 mm²   39.93 mm²
Face-up size outline for 1.5ct Topaz (7.13×7.13mm, round cut)
Face-up size outline for 0.25ct Diamond (3.47×3.47mm, princess cut)
0.25ct Diamond Princess (3.47×3.47mm)
1.5ct Topaz Round (7.13×7.13mm)
Difference: 232% (27.89 mm²)
1.5ct Topaz (Round, 7.13×7.13mm) has approx. 232% more face-up area than 0.25ct Diamond (Princess, 3.47×3.47mm). In other words, it's 3.32x larger.


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