×
carat vs. color  length*  width*
  ×

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

0.5ct Amethyst (Round, 5.44×5.44mm, Violet) vs 0.51ct Sapphire (Emerald, 5.1×3.78mm, Blue)


Quick summary: When looked from above (face-up position), 0.5ct Amethyst (5.44×5.44mm, round cut) appears 30% larger than 0.51ct Sapphire (5.1×3.78mm, emerald cut). See below how they compare side-by-side on a ring and finger.

0.5ct Amethyst (round cut)
vs
 0.51ct Sapphire (emerald cut)
violet
 
blue
5.44×5.44 mm 5.1×3.78 mm
actual size
Actual size of 0.5ct Amethyst (round cut, 5.44×5.44mm, Violet color)   Actual size of 0.51ct Sapphire (emerald cut, 5.1×3.78mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 0.5ct Amethyst (round cut, 5.44×5.44mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.51ct Sapphire (emerald cut, 5.1×3.78mm) 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
 33% vs 23%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.5ct Amethyst Round (5.44×5.44mm, Violet) and 0.51ct Sapphire Emerald (5.1×3.78mm, 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, Sapphire will face-up smaller than Amethyst for a given carat weight, because it has higher specific gravity (4 vs. 2.65 - this means it's "heavier" compared to Amethyst 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 Amethyst (Round) 0.51 Ct Sapphire (Emerald)
5.44×5.44 mm vs 5.1×3.78 mm
23.24 mm²   17.93 mm²
Face-up size outline for 0.5ct Amethyst (5.44×5.44mm, round cut)
Face-up size outline for 0.51ct Sapphire (5.1×3.78mm, emerald cut)
0.5ct Amethyst Round (5.44×5.44mm)
0.51ct Sapphire Emerald (5.1×3.78mm)
Difference: 30% (5.31 mm²)
0.5ct Amethyst (Round, 5.44×5.44mm) has approx. 30% more face-up area than 0.51ct Sapphire (Emerald, 5.1×3.78mm).


Popular comparisons: