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2.05ct Topaz (Round, 7.92×7.92mm, Blue) vs 0.51ct Diamond (Round, 5.19×5.19mm, White)


Quick summary: When looked from above (face-up position), 2.05ct Topaz (7.92×7.92mm, round cut) appears 2.3 times larger than 0.51ct Diamond (5.19×5.19mm, round cut). See below how they compare side-by-side on a ring and finger.

2.05ct Topaz (round cut)
vs
 0.51ct Diamond (round cut)
blue
 
white
7.92×7.92 mm 5.19×5.19 mm
actual size
Actual size of 2.05ct Topaz (round cut, 7.92×7.92mm, Blue color)   Actual size of 0.51ct Diamond (round cut, 5.19×5.19mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 2.05ct Topaz (round cut, 7.92×7.92mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.51ct Diamond (round cut, 5.19×5.19mm) 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
 47% vs 31%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 2.05ct Topaz Round (7.92×7.92mm, Blue) and 0.51ct Diamond Round (5.19×5.19mm, 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, 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.


2.05 Ct Topaz (Round) 0.51 Ct Diamond (Round)
7.92×7.92 mm vs 5.19×5.19 mm
49.27 mm²   21.16 mm²
Face-up size outline for 2.05ct Topaz (7.92×7.92mm, round cut)
Face-up size outline for 0.51ct Diamond (5.19×5.19mm, round cut)
2.05ct Topaz Round (7.92×7.92mm)
0.51ct Diamond Round (5.19×5.19mm)
Difference: 133% (28.11 mm²)
2.05ct Topaz (Round, 7.92×7.92mm) has approx. 133% more face-up area than 0.51ct Diamond (Round, 5.19×5.19mm). In other words, it's 2.33x larger.


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