×
carat vs. color  length*  width*
  ×

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

0.5ct Spinel (Round, 4.91×4.91mm, Red) vs 3ct Sapphire (Emerald, 9.21×6.82mm, Yellow)


Quick summary: When looked from above (face-up position), 3ct Sapphire (9.21×6.82mm, emerald cut) appears 3.1 times larger than 0.5ct Spinel (4.91×4.91mm, round cut). See below how they compare side-by-side on a ring and finger.

0.5ct Spinel (round cut)
vs
 3ct Sapphire (emerald cut)
red
 
yellow
4.91×4.91 mm 9.21×6.82 mm
actual size
Actual size of 0.5ct Spinel (round cut, 4.91×4.91mm, Red color)   Actual size of 3ct Sapphire (emerald cut, 9.21×6.82mm, Yellow color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.5ct Spinel (round cut, 4.91×4.91mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Yellow 3ct Sapphire (emerald cut, 9.21×6.82mm) 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
 30% vs 41%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.5ct Spinel Round (4.91×4.91mm, Red) and 3ct Sapphire Emerald (9.21×6.82mm, Yellow) 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 Spinel for a given carat weight, because it has higher specific gravity (4 vs. 3.6 - this means it's "heavier" compared to Spinel 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.


0.5 Ct Spinel (Round) 3 Ct Sapphire (Emerald)
4.91×4.91 mm vs 9.21×6.82 mm
18.93 mm²   58.42 mm²
Face-up size outline for 3ct Sapphire (9.21×6.82mm, emerald cut)
Face-up size outline for 0.5ct Spinel (4.91×4.91mm, round cut)
0.5ct Spinel Round (4.91×4.91mm)
3ct Sapphire Emerald (9.21×6.82mm)
Difference: 209% (39.49 mm²)
3ct Sapphire (Emerald, 9.21×6.82mm) has approx. 209% more face-up area than 0.5ct Spinel (Round, 4.91×4.91mm). In other words, it's 3.09x larger.


Popular comparisons: