×
carat vs. color  length*  width*
  ×

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

28ct Sapphire (Round, 18.15×18.15mm, Blue) vs 28ct Fluorite (Round, 19.6×19.6mm, Bluish Green)


Quick summary: When looked from above (face-up position), 28ct Fluorite (19.6×19.6mm, round cut) appears 17% larger than 28ct Sapphire (18.15×18.15mm, round cut). See below how they compare side-by-side on a ring and finger.

28ct Sapphire (round cut)
vs
 28ct Fluorite (round cut)
blue
 
bluish green
18.15×18.15 mm 19.6×19.6 mm
actual size
Actual size of 28ct Sapphire (round cut, 18.15×18.15mm, Blue color)   Actual size of 28ct Fluorite (round cut, 19.6×19.6mm, Bluish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 28ct Sapphire (round cut, 18.15×18.15mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Bluish Green 28ct Fluorite (round cut, 19.6×19.6mm) 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
 108% vs 116%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 28ct Sapphire Round (18.15×18.15mm, Blue) and 28ct Fluorite Round (19.6×19.6mm, 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, Sapphire will face-up smaller than Fluorite for a given carat weight, because it has higher specific gravity (4 vs. 3.18 - this means it's "heavier" compared to Fluorite 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.


28 Ct Sapphire (Round) 28 Ct Fluorite (Round)
18.15×18.15 mm vs 19.6×19.6 mm
258.73 mm²   301.72 mm²
Face-up size outline for 28ct Fluorite (19.6×19.6mm, round cut)
Face-up size outline for 28ct Sapphire (18.15×18.15mm, round cut)
28ct Sapphire Round (18.15×18.15mm)
28ct Fluorite Round (19.6×19.6mm)
Difference: 17% (42.99 mm²)
28ct Fluorite (Round, 19.6×19.6mm) has approx. 17% more face-up area than 28ct Sapphire (Round, 18.15×18.15mm).


Popular comparisons: