×
carat vs. color  length*  width*
  ×

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

3.5ct Diamond (Oval, 12.32×8.21mm, White) vs 4.5ct Sapphire (Oval, 12.48×8.32mm, Dark Blue)


Quick summary: When looked from above (face-up position), 4.5ct Sapphire (12.48×8.32mm, oval cut) appears 3% larger than 3.5ct Diamond (12.32×8.21mm, oval cut). See below how they compare side-by-side on a ring and finger.

3.5ct Diamond (oval cut)
vs
 4.5ct Sapphire (oval cut)
white
 
dark blue
12.32×8.21 mm 12.48×8.32 mm
actual size
Actual size of 3.5ct Diamond (oval cut, 12.32×8.21mm, White color)   Actual size of 4.5ct Sapphire (oval cut, 12.48×8.32mm, Dark Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 3.5ct Diamond (oval cut, 12.32×8.21mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Blue 4.5ct Sapphire (oval cut, 12.48×8.32mm) 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
 49% vs 50%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 3.5ct Diamond Oval (12.32×8.21mm, White) and 4.5ct Sapphire Oval (12.48×8.32mm, Dark 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 Diamond for a given carat weight, because it has higher specific gravity (4 vs. 3.52 - this means it's "heavier" compared to Diamond 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.


3.5 Ct Diamond (Oval) 4.5 Ct Sapphire (Oval)
12.32×8.21 mm vs 12.48×8.32 mm
82.94 mm²   85.14 mm²
Face-up size outline for 4.5ct Sapphire (12.48×8.32mm, oval cut)
Face-up size outline for 3.5ct Diamond (12.32×8.21mm, oval cut)
3.5ct Diamond Oval (12.32×8.21mm)
4.5ct Sapphire Oval (12.48×8.32mm)
Difference: 3% (2.2 mm²)
4.5ct Sapphire (Oval, 12.48×8.32mm) has approx. 3% more face-up area than 3.5ct Diamond (Oval, 12.32×8.21mm).


Popular comparisons: