×
carat vs. color  length*  width*
  ×

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

3.4ct Sapphire (Cushion, 9×7mm, Blue) vs 2ct Diamond (Cushion, 8×8mm, White)


Quick summary: When looked from above (face-up position), 2ct Diamond (8×8mm, cushion cut) appears 2% larger than 3.4ct Sapphire (9×7mm, cushion cut). See below how they compare side-by-side on a ring and finger.

3.4ct Sapphire (cushion cut)
vs
 2ct Diamond (cushion cut)
blue
 
white
9×7 mm 8×8 mm
actual size
Actual size of 3.4ct Sapphire (cushion cut, 9×7mm, Blue color)   Actual size of 2ct Diamond (cushion cut, 8×8mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 3.4ct Sapphire (cushion cut, 9×7mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 2ct Diamond (cushion cut, 8×8mm) 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
 42% vs 48%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 3.4ct Sapphire Cushion (9×7mm, Blue) and 2ct Diamond Cushion (8×8mm, White) 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.


3.4 Ct Sapphire (Cushion) 2 Ct Diamond (Cushion)
9×7 mm vs 8×8 mm
56.7 mm²   57.6 mm²
Face-up size outline for 2ct Diamond (8×8mm, cushion cut)
Face-up size outline for 3.4ct Sapphire (9×7mm, cushion cut)
3.4ct Sapphire Cushion (9×7mm)
2ct Diamond Cushion (8×8mm)
Difference: 2% (0.9 mm²)
2ct Diamond (Cushion, 8×8mm) has approx. 2% more face-up area than 3.4ct Sapphire (Cushion, 9×7mm).


Popular comparisons: