×
carat vs. color  length*  width*
  ×

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

3ct Sapphire (Trillion, 10.14×10.14mm, Blue) vs 19ct Diamond (Princess, 14.7×14.7mm, White)


Quick summary: When looked from above (face-up position), 19ct Diamond (14.7×14.7mm, princess cut) appears 3.4 times larger than 3ct Sapphire (10.14×10.14mm, trillion cut). See below how they compare side-by-side on a ring and finger.

3ct Sapphire (trillion cut)
vs
 19ct Diamond (princess cut)
blue
 
white
10.14×10.14 mm 14.7×14.7 mm
actual size
Actual size of 3ct Sapphire (trillion cut, 10.14×10.14mm, Blue color)   Actual size of 19ct Diamond (princess cut, 14.7×14.7mm, 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 19ct Diamond (princess cut, 14.7×14.7mm) 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 87%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 3ct Sapphire Trillion (10.14×10.14mm, Blue) and 19ct Diamond Princess (14.7×14.7mm, 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) 19 Ct Diamond (Princess)
10.14×10.14 mm vs 14.7×14.7 mm
63.75 mm²   216.09 mm²
Face-up size outline for 19ct Diamond (14.7×14.7mm, princess cut)
Face-up size outline for 3ct Sapphire (10.14×10.14mm, trillion cut)
3ct Sapphire Trillion (10.14×10.14mm)
19ct Diamond Princess (14.7×14.7mm)
Difference: 239% (152.34 mm²)
19ct Diamond (Princess, 14.7×14.7mm) has approx. 239% more face-up area than 3ct Sapphire (Trillion, 10.14×10.14mm). In other words, it's 3.39x larger.


Popular comparisons: