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2.58ct Kyanite (Cushion, 7.89×7.89mm, Blue) vs 3ct Tanzanite (Emerald, 9.81×7.27mm, Blue)


Quick summary: When looked from above (face-up position), 3ct Tanzanite (9.81×7.27mm, emerald cut) appears 18% larger than 2.58ct Kyanite (7.89×7.89mm, cushion cut). See below how they compare side-by-side on a ring and finger.

2.58ct Kyanite (cushion cut)
vs
 3ct Tanzanite (emerald cut)
blue
 
blue
7.89×7.89 mm 9.81×7.27 mm
actual size
Actual size of 2.58ct Kyanite (cushion cut, 7.89×7.89mm, Blue color)   Actual size of 3ct Tanzanite (emerald cut, 9.81×7.27mm, Blue color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 2.58ct Kyanite (cushion cut, 7.89×7.89mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 3ct Tanzanite (emerald cut, 9.81×7.27mm) 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
 47% vs 44%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 2.58ct Kyanite Cushion (7.89×7.89mm, Blue) and 3ct Tanzanite Emerald (9.81×7.27mm, 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.


2.58 Ct Kyanite (Cushion) 3 Ct Tanzanite (Emerald)
7.89×7.89 mm vs 9.81×7.27 mm
56.03 mm²   66.33 mm²
Face-up size outline for 3ct Tanzanite (9.81×7.27mm, emerald cut)
Face-up size outline for 2.58ct Kyanite (7.89×7.89mm, cushion cut)
2.58ct Kyanite Cushion (7.89×7.89mm)
3ct Tanzanite Emerald (9.81×7.27mm)
Difference: 18% (10.3 mm²)
3ct Tanzanite (Emerald, 9.81×7.27mm) has approx. 18% more face-up area than 2.58ct Kyanite (Cushion, 7.89×7.89mm).


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