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30ct Fluorite (Round, 20.05×20.05mm, Bluish Green) vs 30ct Topaz (Round, 19.37×19.37mm, Blue)


Quick summary: When looked from above (face-up position), 30ct Fluorite (20.05×20.05mm, round cut) appears 7% larger than 30ct Topaz (19.37×19.37mm, round cut). See below how they compare side-by-side on a ring and finger.

30ct Fluorite (round cut)
vs
 30ct Topaz (round cut)
bluish green
 
blue
20.05×20.05 mm 19.37×19.37 mm
actual size
Actual size of 30ct Fluorite (round cut, 20.05×20.05mm, Bluish Green color)   Actual size of 30ct Topaz (round cut, 19.37×19.37mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Bluish Green 30ct Fluorite (round cut, 20.05×20.05mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 30ct Topaz (round cut, 19.37×19.37mm) 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
 119% vs 115%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 30ct Fluorite Round (20.05×20.05mm, Bluish Green) and 30ct Topaz Round (19.37×19.37mm, 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 smaller than Fluorite for a given carat weight, because it has higher specific gravity (3.53 vs. 3.18 - this means it's "heavier" compared to Fluorite 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.


30 Ct Fluorite (Round) 30 Ct Topaz (Round)
20.05×20.05 mm vs 19.37×19.37 mm
315.73 mm²   294.68 mm²
Face-up size outline for 30ct Fluorite (20.05×20.05mm, round cut)
Face-up size outline for 30ct Topaz (19.37×19.37mm, round cut)
30ct Fluorite Round (20.05×20.05mm)
30ct Topaz Round (19.37×19.37mm)
Difference: 7% (21.05 mm²)
30ct Fluorite (Round, 20.05×20.05mm) has approx. 7% more face-up area than 30ct Topaz (Round, 19.37×19.37mm).


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