×
carat vs. color  length*  width*
  ×

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

16ct Diaspore (Round, 15.9×15.9mm, Light Yellowish Green) vs 16ct Alexandrite (Round, 15.42×15.42mm, Bluish Green)


Quick summary: When looked from above (face-up position), 16ct Diaspore (15.9×15.9mm, round cut) appears 6% larger than 16ct Alexandrite (15.42×15.42mm, round cut). See below how they compare side-by-side on a ring and finger.

16ct Diaspore (round cut)
vs
 16ct Alexandrite (round cut)
light yellowish green
 
bluish green
15.9×15.9 mm 15.42×15.42 mm
actual size
Actual size of 16ct Diaspore (round cut, 15.9×15.9mm, Light Yellowish Green color)   Actual size of 16ct Alexandrite (round cut, 15.42×15.42mm, Bluish Green color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Yellowish Green 16ct Diaspore (round cut, 15.9×15.9mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 16ct Alexandrite (round cut, 15.42×15.42mm) 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
 95% vs 92%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 16ct Diaspore Round (15.9×15.9mm, Light Yellowish Green) and 16ct Alexandrite Round (15.42×15.42mm, Bluish Green) 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, Alexandrite will face-up smaller than Diaspore for a given carat weight, because it has higher specific gravity (3.73 vs. 3.4 - this means it's "heavier" compared to Diaspore 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.


16 Ct Diaspore (Round) 16 Ct Alexandrite (Round)
15.9×15.9 mm vs 15.42×15.42 mm
198.56 mm²   186.75 mm²
Face-up size outline for 16ct Diaspore (15.9×15.9mm, round cut)
Face-up size outline for 16ct Alexandrite (15.42×15.42mm, round cut)
16ct Diaspore Round (15.9×15.9mm)
16ct Alexandrite Round (15.42×15.42mm)
Difference: 6% (11.81 mm²)
16ct Diaspore (Round, 15.9×15.9mm) has approx. 6% more face-up area than 16ct Alexandrite (Round, 15.42×15.42mm).


Popular comparisons: