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2.5ct Diamond (Round, 8.82×8.82mm, White) vs 3.5ct Sapphire (Emerald, 9.5×6.27mm, Blue)


Quick summary: When looked from above (face-up position), 2.5ct Diamond (8.82×8.82mm, round cut) appears 10% larger than 3.5ct Sapphire (9.5×6.27mm, emerald cut). See below how they compare side-by-side on a ring and finger.

2.5ct Diamond (round cut)
vs
 3.5ct Sapphire (emerald cut)
white
 
blue
8.82×8.82 mm 9.5×6.27 mm
actual size
Actual size of 2.5ct Diamond (round cut, 8.82×8.82mm, White color)   Actual size of 3.5ct Sapphire (emerald cut, 9.5×6.27mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 2.5ct Diamond (round cut, 8.82×8.82mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 3.5ct Sapphire (emerald cut, 9.5×6.27mm) 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
 53% vs 38%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 2.5ct Diamond Round (8.82×8.82mm, White) and 3.5ct Sapphire Emerald (9.5×6.27mm, 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.


2.5 Ct Diamond (Round) 3.5 Ct Sapphire (Emerald)
8.82×8.82 mm vs 9.5×6.27 mm
61.1 mm²   55.4 mm²
Face-up size outline for 2.5ct Diamond (8.82×8.82mm, round cut)
Face-up size outline for 3.5ct Sapphire (9.5×6.27mm, emerald cut)
2.5ct Diamond Round (8.82×8.82mm)
3.5ct Sapphire Emerald (9.5×6.27mm)
Difference: 10% (5.7 mm²)
2.5ct Diamond (Round, 8.82×8.82mm) has approx. 10% more face-up area than 3.5ct Sapphire (Emerald, 9.5×6.27mm).


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