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0.33ct Sapphire (Round, 4.13×4.13mm, Blue) vs 0.33ct Diamond (Round, 4.49×4.49mm, White)


Quick summary: When looked from above (face-up position), 0.33ct Diamond (4.49×4.49mm, round cut) appears 18% larger than 0.33ct Sapphire (4.13×4.13mm, round cut). See below how they compare side-by-side on a ring and finger.

0.33ct Sapphire (round cut)
vs
 0.33ct Diamond (round cut)
blue
 
white
4.13×4.13 mm 4.49×4.49 mm
actual size
Actual size of 0.33ct Sapphire (round cut, 4.13×4.13mm, Blue color)   Actual size of 0.33ct Diamond (round cut, 4.49×4.49mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 0.33ct Sapphire (round cut, 4.13×4.13mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.33ct Diamond (round cut, 4.49×4.49mm) 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
 25% vs 27%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.33ct Sapphire Round (4.13×4.13mm, Blue) and 0.33ct Diamond Round (4.49×4.49mm, 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.


0.33 Ct Sapphire (Round) 0.33 Ct Diamond (Round)
4.13×4.13 mm vs 4.49×4.49 mm
13.4 mm²   15.83 mm²
Face-up size outline for 0.33ct Diamond (4.49×4.49mm, round cut)
Face-up size outline for 0.33ct Sapphire (4.13×4.13mm, round cut)
0.33ct Sapphire Round (4.13×4.13mm)
0.33ct Diamond Round (4.49×4.49mm)
Difference: 18% (2.43 mm²)
0.33ct Diamond (Round, 4.49×4.49mm) has approx. 18% more face-up area than 0.33ct Sapphire (Round, 4.13×4.13mm).


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