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0.79ct Diamond (Round, 5.8×5.78mm, White) vs 1ct Sapphire (Round, 5.80×5.80mm, Blue)


Quick summary: When looked from above (face-up position), 1ct Sapphire (5.80×5.80mm, round cut) appears 0.3% larger than 0.79ct Diamond (5.8×5.78mm, round cut). See below how they compare side-by-side on a ring and finger.

0.79ct Diamond (round cut)
vs
 1ct Sapphire (round cut)
white
 
blue
5.8×5.78 mm 5.80×5.80 mm
actual size
Actual size of 0.79ct Diamond (round cut, 5.8×5.78mm, White color)   Actual size of 1ct Sapphire (round cut, 5.80×5.80mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.79ct Diamond (round cut, 5.8×5.78mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1ct Sapphire (round cut, 5.80×5.80mm) 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
 35% vs 35%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.79ct Diamond Round (5.8×5.78mm, White) and 1ct Sapphire Round (5.80×5.80mm, 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.


0.79 Ct Diamond (Round) 1 Ct Sapphire (Round)
5.8×5.78 mm vs 5.80×5.80 mm
26.33 mm²   26.42 mm²
Face-up size outline for 1ct Sapphire (5.80×5.80mm, round cut)
Face-up size outline for 0.79ct Diamond (5.8×5.78mm, round cut)
0.79ct Diamond Round (5.8×5.78mm)
1ct Sapphire Round (5.80×5.80mm)
Difference: 0.3% (0.09 mm²)
1ct Sapphire (Round, 5.80×5.80mm) has approx. 0.3% more face-up area than 0.79ct Diamond (Round, 5.8×5.78mm).


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