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4ct Tanzanite (Oval, 12.92×8.61mm, Blue) vs 4ct Kyanite (Oval, 12.51×8.34mm, Blue)


Quick summary: When looked from above (face-up position), 4ct Tanzanite (12.92×8.61mm, oval cut) appears 7% larger than 4ct Kyanite (12.51×8.34mm, oval cut). See below how they compare side-by-side on a ring and finger.

4ct Tanzanite (oval cut)
vs
 4ct Kyanite (oval cut)
blue
 
blue
12.92×8.61 mm 12.51×8.34 mm
actual size
Actual size of 4ct Tanzanite (oval cut, 12.92×8.61mm, Blue color)   Actual size of 4ct Kyanite (oval cut, 12.51×8.34mm, Blue color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 4ct Tanzanite (oval cut, 12.92×8.61mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 4ct Kyanite (oval cut, 12.51×8.34mm) 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
 51% vs 50%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Tanzanite Oval (12.92×8.61mm, Blue) and 4ct Kyanite Oval (12.51×8.34mm, 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.


4 Ct Tanzanite (Oval) 4 Ct Kyanite (Oval)
12.92×8.61 mm vs 12.51×8.34 mm
91.22 mm²   85.55 mm²
Face-up size outline for 4ct Tanzanite (12.92×8.61mm, oval cut)
Face-up size outline for 4ct Kyanite (12.51×8.34mm, oval cut)
4ct Tanzanite Oval (12.92×8.61mm)
4ct Kyanite Oval (12.51×8.34mm)
Difference: 7% (5.67 mm²)
4ct Tanzanite (Oval, 12.92×8.61mm) has approx. 7% more face-up area than 4ct Kyanite (Oval, 12.51×8.34mm).


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