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1.25ct Kyanite (Round, 6.62×6.62mm, Blue) vs 1.25ct Topaz (Round, 6.71×6.71mm, Blue)


Quick summary: When looked from above (face-up position), 1.25ct Topaz (6.71×6.71mm, round cut) appears 3% larger than 1.25ct Kyanite (6.62×6.62mm, round cut). See below how they compare side-by-side on a ring and finger.

1.25ct Kyanite (round cut)
vs
 1.25ct Topaz (round cut)
blue
 
blue
6.62×6.62 mm 6.71×6.71 mm
actual size
Actual size of 1.25ct Kyanite (round cut, 6.62×6.62mm, Blue color)   Actual size of 1.25ct Topaz (round cut, 6.71×6.71mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1.25ct Kyanite (round cut, 6.62×6.62mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1.25ct Topaz (round cut, 6.71×6.71mm) 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
 40% vs 40%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 1.25ct Kyanite Round (6.62×6.62mm, Blue) and 1.25ct Topaz Round (6.71×6.71mm, 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, Kyanite will face-up smaller than Topaz for a given carat weight, because it has higher specific gravity (3.68 vs. 3.53 - this means it's "heavier" compared to Topaz 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.


1.25 Ct Kyanite (Round) 1.25 Ct Topaz (Round)
6.62×6.62 mm vs 6.71×6.71 mm
34.42 mm²   35.36 mm²
Face-up size outline for 1.25ct Topaz (6.71×6.71mm, round cut)
Face-up size outline for 1.25ct Kyanite (6.62×6.62mm, round cut)
1.25ct Kyanite Round (6.62×6.62mm)
1.25ct Topaz Round (6.71×6.71mm)
Difference: 3% (0.94 mm²)
1.25ct Topaz (Round, 6.71×6.71mm) has approx. 3% more face-up area than 1.25ct Kyanite (Round, 6.62×6.62mm).


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