×
carat vs. color  length*  width*
  ×

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

0.78ct Diamond (Round, 5.98×5.98mm, White) vs 1.28ct Sapphire (Round, 6.3×6.3mm, Dark Bluish Green)


Quick summary: When looked from above (face-up position), 1.28ct Sapphire (6.3×6.3mm, round cut) appears 11% larger than 0.78ct Diamond (5.98×5.98mm, round cut). See below how they compare side-by-side on a ring and finger.

0.78ct Diamond (round cut)
vs
 1.28ct Sapphire (round cut)
white
 
dark bluish green
5.98×5.98 mm 6.3×6.3 mm
actual size
Actual size of 0.78ct Diamond (round cut, 5.98×5.98mm, White color)   Actual size of 1.28ct Sapphire (round cut, 6.3×6.3mm, Dark Bluish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.78ct Diamond (round cut, 5.98×5.98mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Bluish Green 1.28ct Sapphire (round cut, 6.3×6.3mm) 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
 36% vs 38%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.78ct Diamond Round (5.98×5.98mm, White) and 1.28ct Sapphire Round (6.3×6.3mm, Dark 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 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.


0.78 Ct Diamond (Round) 1.28 Ct Sapphire (Round)
5.98×5.98 mm vs 6.3×6.3 mm
28.09 mm²   31.17 mm²
Face-up size outline for 1.28ct Sapphire (6.3×6.3mm, round cut)
Face-up size outline for 0.78ct Diamond (5.98×5.98mm, round cut)
0.78ct Diamond Round (5.98×5.98mm)
1.28ct Sapphire Round (6.3×6.3mm)
Difference: 11% (3.08 mm²)
1.28ct Sapphire (Round, 6.3×6.3mm) has approx. 11% more face-up area than 0.78ct Diamond (Round, 5.98×5.98mm).


Popular comparisons: