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1.2ct Diamond (Round, 6.91×6.91mm, Blue) vs 2.75ct Sapphire (Oval, 9.36×7.38mm, Blue)


Quick summary: When looked from above (face-up position), 2.75ct Sapphire (9.36×7.38mm, oval cut) appears 51% larger than 1.2ct Colored Diamond (6.91×6.91mm, round cut). See below how they compare side-by-side on a ring and finger.

1.2ct Diamond (round cut)
vs
 2.75ct Sapphire (oval cut)
blue
 
blue
6.91×6.91 mm 9.36×7.38 mm
actual size
Actual size of 1.2ct Diamond (round cut, 6.91×6.91mm, Blue color)   Actual size of 2.75ct Sapphire (oval cut, 9.36×7.38mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1.2ct Diamond (round cut, 6.91×6.91mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 2.75ct Sapphire (oval cut, 9.36×7.38mm) 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
 41% vs 44%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.2ct Diamond Round (6.91×6.91mm, Blue) and 2.75ct Sapphire Oval (9.36×7.38mm, 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.


1.2 Ct Colored Diamond (Round) 2.75 Ct Sapphire (Oval)
6.91×6.91 mm vs 9.36×7.38 mm
37.5 mm²   56.64 mm²
Face-up size outline for 2.75ct Sapphire (9.36×7.38mm, oval cut)
Face-up size outline for 1.2ct Diamond (6.91×6.91mm, round cut)
1.2ct Colored Diamond Round (6.91×6.91mm)
2.75ct Sapphire Oval (9.36×7.38mm)
Difference: 51% (19.14 mm²)
2.75ct Sapphire (Oval, 9.36×7.38mm) has approx. 51% more face-up area than 1.2ct Colored Diamond (Round, 6.91×6.91mm).


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