×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

8.5ct Kyanite (Round, 12.54×12.54mm, Blue) vs 8.5ct Benitoite (Round, 12.58×12.58mm, Blue)


Quick summary: When looked from above (face-up position), 8.5ct Benitoite (12.58×12.58mm, round cut) appears 0.6% larger than 8.5ct Kyanite (12.54×12.54mm, round cut). See below how they compare side-by-side on a ring and finger.

8.5ct Kyanite (round cut)
vs
 8.5ct Benitoite (round cut)
blue
 
blue
12.54×12.54 mm 12.58×12.58 mm
actual size
Actual size of 8.5ct Kyanite (round cut, 12.54×12.54mm, Blue color)   Actual size of 8.5ct Benitoite (round cut, 12.58×12.58mm, Blue color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 8.5ct Kyanite (round cut, 12.54×12.54mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 8.5ct Benitoite (round cut, 12.58×12.58mm) 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
 75% vs 75%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 8.5ct Kyanite Round (12.54×12.54mm, Blue) and 8.5ct Benitoite Round (12.58×12.58mm, 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 slightly smaller than Benitoite for a given carat weight, because it has higher specific gravity (3.68 vs. 3.65 - this means it's "slightly heavier" compared to Benitoite 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.


8.5 Ct Kyanite (Round) 8.5 Ct Benitoite (Round)
12.54×12.54 mm vs 12.58×12.58 mm
123.51 mm²   124.29 mm²
Face-up size outline for 8.5ct Benitoite (12.58×12.58mm, round cut)
Face-up size outline for 8.5ct Kyanite (12.54×12.54mm, round cut)
8.5ct Kyanite Round (12.54×12.54mm)
8.5ct Benitoite Round (12.58×12.58mm)
Difference: 0.6% (0.78 mm²)
8.5ct Benitoite (Round, 12.58×12.58mm) has approx. 0.6% more face-up area than 8.5ct Kyanite (Round, 12.54×12.54mm).


Popular comparisons: