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0.25ct Diamond (Trillion, 4.87×4.87mm, White) vs 3ct Sapphire (Cushion, 8.06×8.06mm, Blue)


Quick summary: When looked from above (face-up position), 3ct Sapphire (8.06×8.06mm, cushion cut) appears 4 times larger than 0.25ct Diamond (4.87×4.87mm, trillion cut). See below how they compare side-by-side on a ring and finger.

0.25ct Diamond (trillion cut)
vs
 3ct Sapphire (cushion cut)
white
 
blue
4.87×4.87 mm 8.06×8.06 mm
actual size
Actual size of 0.25ct Diamond (trillion cut, 4.87×4.87mm, White color)   Actual size of 3ct Sapphire (cushion cut, 8.06×8.06mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.25ct Diamond (trillion cut, 4.87×4.87mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 3ct Sapphire (cushion cut, 8.06×8.06mm) 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
 29% vs 48%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.25ct Diamond Trillion (4.87×4.87mm, White) and 3ct Sapphire Cushion (8.06×8.06mm, 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.


0.25 Ct Diamond (Trillion) 3 Ct Sapphire (Cushion)
4.87×4.87 mm vs 8.06×8.06 mm
14.7 mm²   58.47 mm²
Face-up size outline for 3ct Sapphire (8.06×8.06mm, cushion cut)
Face-up size outline for 0.25ct Diamond (4.87×4.87mm, trillion cut)
0.25ct Diamond Trillion (4.87×4.87mm)
3ct Sapphire Cushion (8.06×8.06mm)
Difference: 298% (43.77 mm²)
3ct Sapphire (Cushion, 8.06×8.06mm) has approx. 298% more face-up area than 0.25ct Diamond (Trillion, 4.87×4.87mm). In other words, it's 3.98x larger.


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