×
carat vs. color  length*  width*
  ×

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

3ct Sapphire (Trillion, 10.14×10.14mm, Blue) vs 1.75ct Diamond (Round, 7.83×7.83mm, White)


Quick summary: When looked from above (face-up position), 3ct Sapphire (10.14×10.14mm, trillion cut) appears 32% larger than 1.75ct Diamond (7.83×7.83mm, round cut). See below how they compare side-by-side on a ring and finger.

3ct Sapphire (trillion cut)
vs
 1.75ct Diamond (round cut)
blue
 
white
10.14×10.14 mm 7.83×7.83 mm
actual size
Actual size of 3ct Sapphire (trillion cut, 10.14×10.14mm, Blue color)   Actual size of 1.75ct Diamond (round cut, 7.83×7.83mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 3ct Sapphire (trillion cut, 10.14×10.14mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1.75ct Diamond (round cut, 7.83×7.83mm) 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
 61% vs 47%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 3ct Sapphire Trillion (10.14×10.14mm, Blue) and 1.75ct Diamond Round (7.83×7.83mm, 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 Ct Sapphire (Trillion) 1.75 Ct Diamond (Round)
10.14×10.14 mm vs 7.83×7.83 mm
63.75 mm²   48.15 mm²
Face-up size outline for 3ct Sapphire (10.14×10.14mm, trillion cut)
Face-up size outline for 1.75ct Diamond (7.83×7.83mm, round cut)
3ct Sapphire Trillion (10.14×10.14mm)
1.75ct Diamond Round (7.83×7.83mm)
Difference: 32% (15.6 mm²)
3ct Sapphire (Trillion, 10.14×10.14mm) has approx. 32% more face-up area than 1.75ct Diamond (Round, 7.83×7.83mm).


Popular comparisons: