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20ct Topaz (Round, 16.92×16.92mm, Blue) vs 1.5ct Diamond (Emerald, 7.65×5.67mm, White)


Quick summary: When looked from above (face-up position), 20ct Topaz (16.92×16.92mm, round cut) appears 5.6 times larger than 1.5ct Diamond (7.65×5.67mm, emerald cut). See below how they compare side-by-side on a ring and finger.

20ct Topaz (round cut)
vs
 1.5ct Diamond (emerald cut)
blue
 
white
16.92×16.92 mm 7.65×5.67 mm
actual size
Actual size of 20ct Topaz (round cut, 16.92×16.92mm, Blue color)   Actual size of 1.5ct Diamond (emerald cut, 7.65×5.67mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 20ct Topaz (round cut, 16.92×16.92mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1.5ct Diamond (emerald cut, 7.65×5.67mm) 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
 101% vs 34%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Topaz Round (16.92×16.92mm, Blue) and 1.5ct Diamond Emerald (7.65×5.67mm, 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.


20 Ct Topaz (Round) 1.5 Ct Diamond (Emerald)
16.92×16.92 mm vs 7.65×5.67 mm
224.85 mm²   40.34 mm²
Face-up size outline for 20ct Topaz (16.92×16.92mm, round cut)
Face-up size outline for 1.5ct Diamond (7.65×5.67mm, emerald cut)
20ct Topaz Round (16.92×16.92mm)
1.5ct Diamond Emerald (7.65×5.67mm)
Difference: 457% (184.51 mm²)
20ct Topaz (Round, 16.92×16.92mm) has approx. 457% more face-up area than 1.5ct Diamond (Emerald, 7.65×5.67mm). In other words, it's 5.57x larger.


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