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0.75ct Kyanite (Princess, 4.91×4.91mm, Blue) vs 0.75ct Topaz (Princess, 4.98×4.98mm, Blue)


Quick summary: When looked from above (face-up position), 0.75ct Topaz (4.98×4.98mm, princess cut) appears 3% larger than 0.75ct Kyanite (4.91×4.91mm, princess cut). See below how they compare side-by-side on a ring and finger.

0.75ct Kyanite (princess cut)
vs
 0.75ct Topaz (princess cut)
blue
 
blue
4.91×4.91 mm 4.98×4.98 mm
actual size
Actual size of 0.75ct Kyanite (princess cut, 4.91×4.91mm, Blue color)   Actual size of 0.75ct Topaz (princess cut, 4.98×4.98mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 0.75ct Kyanite (princess cut, 4.91×4.91mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.75ct Topaz (princess cut, 4.98×4.98mm) 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
 30% vs 30%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.75ct Kyanite Princess (4.91×4.91mm, Blue) and 0.75ct Topaz Princess (4.98×4.98mm, 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.


0.75 Ct Kyanite (Princess) 0.75 Ct Topaz (Princess)
4.91×4.91 mm vs 4.98×4.98 mm
24.11 mm²   24.8 mm²
Face-up size outline for 0.75ct Topaz (4.98×4.98mm, princess cut)
Face-up size outline for 0.75ct Kyanite (4.91×4.91mm, princess cut)
0.75ct Kyanite Princess (4.91×4.91mm)
0.75ct Topaz Princess (4.98×4.98mm)
Difference: 3% (0.69 mm²)
0.75ct Topaz (Princess, 4.98×4.98mm) has approx. 3% more face-up area than 0.75ct Kyanite (Princess, 4.91×4.91mm).


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