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15ct Kyanite (Round, 15.16×15.16mm, Blue) vs 12ct Diamond (Round, 14.88×14.88mm, White)


Quick summary: When looked from above (face-up position), 15ct Kyanite (15.16×15.16mm, round cut) appears 4% larger than 12ct Diamond (14.88×14.88mm, round cut). See below how they compare side-by-side on a ring and finger.

15ct Kyanite (round cut)
vs
 12ct Diamond (round cut)
blue
 
white
15.16×15.16 mm 14.88×14.88 mm
actual size
Actual size of 15ct Kyanite (round cut, 15.16×15.16mm, Blue color)   Actual size of 12ct Diamond (round cut, 14.88×14.88mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 15ct Kyanite (round cut, 15.16×15.16mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 12ct Diamond (round cut, 14.88×14.88mm) 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
 90% vs 89%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 15ct Kyanite Round (15.16×15.16mm, Blue) and 12ct Diamond Round (14.88×14.88mm, White) 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 Diamond for a given carat weight, because it has higher specific gravity (3.68 vs. 3.52 - this means it's "heavier" compared to Diamond 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.


15 Ct Kyanite (Round) 12 Ct Diamond (Round)
15.16×15.16 mm vs 14.88×14.88 mm
180.5 mm²   173.9 mm²
Face-up size outline for 15ct Kyanite (15.16×15.16mm, round cut)
Face-up size outline for 12ct Diamond (14.88×14.88mm, round cut)
15ct Kyanite Round (15.16×15.16mm)
12ct Diamond Round (14.88×14.88mm)
Difference: 4% (6.6 mm²)
15ct Kyanite (Round, 15.16×15.16mm) has approx. 4% more face-up area than 12ct Diamond (Round, 14.88×14.88mm).


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