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1.25ct Sapphire (Round, 6.44×6.44mm, Blue) vs 0.45ct Diamond (Round, 4.98×4.98mm, White)


Quick summary: When looked from above (face-up position), 1.25ct Sapphire (6.44×6.44mm, round cut) appears 67% larger than 0.45ct Diamond (4.98×4.98mm, round cut). See below how they compare side-by-side on a ring and finger.

1.25ct Sapphire (round cut)
vs
 0.45ct Diamond (round cut)
blue
 
white
6.44×6.44 mm 4.98×4.98 mm
actual size
Actual size of 1.25ct Sapphire (round cut, 6.44×6.44mm, Blue color)   Actual size of 0.45ct Diamond (round cut, 4.98×4.98mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1.25ct Sapphire (round cut, 6.44×6.44mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.45ct Diamond (round cut, 4.98×4.98mm) 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
 39% vs 30%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.25ct Sapphire Round (6.44×6.44mm, Blue) and 0.45ct Diamond Round (4.98×4.98mm, 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.


1.25 Ct Sapphire (Round) 0.45 Ct Diamond (Round)
6.44×6.44 mm vs 4.98×4.98 mm
32.57 mm²   19.48 mm²
Face-up size outline for 1.25ct Sapphire (6.44×6.44mm, round cut)
Face-up size outline for 0.45ct Diamond (4.98×4.98mm, round cut)
1.25ct Sapphire Round (6.44×6.44mm)
0.45ct Diamond Round (4.98×4.98mm)
Difference: 67% (13.09 mm²)
1.25ct Sapphire (Round, 6.44×6.44mm) has approx. 67% more face-up area than 0.45ct Diamond (Round, 4.98×4.98mm).


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