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7.5ct Tanzanite (Marquise, 20.2×10.1mm, Blue) vs 7.5ct Kyanite (Marquise, 19.56×9.78mm, Blue)


Quick summary: When looked from above (face-up position), 7.5ct Tanzanite (20.2×10.1mm, marquise cut) appears 7% larger than 7.5ct Kyanite (19.56×9.78mm, marquise cut). See below how they compare side-by-side on a ring and finger.

7.5ct Tanzanite (marquise cut)
vs
 7.5ct Kyanite (marquise cut)
blue
 
blue
20.2×10.1 mm 19.56×9.78 mm
actual size
Actual size of 7.5ct Tanzanite (marquise cut, 20.2×10.1mm, Blue color)   Actual size of 7.5ct Kyanite (marquise cut, 19.56×9.78mm, Blue color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 7.5ct Tanzanite (marquise cut, 20.2×10.1mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 7.5ct Kyanite (marquise cut, 19.56×9.78mm) 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
 60% vs 58%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 7.5ct Tanzanite Marquise (20.2×10.1mm, Blue) and 7.5ct Kyanite Marquise (19.56×9.78mm, 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 Tanzanite for a given carat weight, because it has higher specific gravity (3.68 vs. 3.35 - this means it's "heavier" compared to Tanzanite 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.


7.5 Ct Tanzanite (Marquise) 7.5 Ct Kyanite (Marquise)
20.2×10.1 mm vs 19.56×9.78 mm
144.85 mm²   135.82 mm²
Face-up size outline for 7.5ct Tanzanite (20.2×10.1mm, marquise cut)
Face-up size outline for 7.5ct Kyanite (19.56×9.78mm, marquise cut)
7.5ct Tanzanite Marquise (20.2×10.1mm)
7.5ct Kyanite Marquise (19.56×9.78mm)
Difference: 7% (9.03 mm²)
7.5ct Tanzanite (Marquise, 20.2×10.1mm) has approx. 7% more face-up area than 7.5ct Kyanite (Marquise, 19.56×9.78mm).


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