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1.8ct Sapphire (Oval, 9.2×6.13mm, Blue) vs 0.15ct Diamond (Round, 3.45×3.45mm, White)


Quick summary: When looked from above (face-up position), 1.8ct Sapphire (9.2×6.13mm, oval cut) appears 5 times larger than 0.15ct Diamond (3.45×3.45mm, round cut). See below how they compare side-by-side on a ring and finger.

1.8ct Sapphire (oval cut)
vs
 0.15ct Diamond (round cut)
blue
 
white
9.2×6.13 mm 3.45×3.45 mm
actual size
Actual size of 1.8ct Sapphire (oval cut, 9.2×6.13mm, Blue color)   Actual size of 0.15ct Diamond (round cut, 3.45×3.45mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1.8ct Sapphire (oval cut, 9.2×6.13mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.15ct Diamond (round cut, 3.45×3.45mm) 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
 37% vs 21%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.8ct Sapphire Oval (9.2×6.13mm, Blue) and 0.15ct Diamond Round (3.45×3.45mm, 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.


1.8 Ct Sapphire (Oval) 0.15 Ct Diamond (Round)
9.2×6.13 mm vs 3.45×3.45 mm
46.24 mm²   9.35 mm²
Face-up size outline for 1.8ct Sapphire (9.2×6.13mm, oval cut)
Face-up size outline for 0.15ct Diamond (3.45×3.45mm, round cut)
1.8ct Sapphire Oval (9.2×6.13mm)
0.15ct Diamond Round (3.45×3.45mm)
Difference: 395% (36.89 mm²)
1.8ct Sapphire (Oval, 9.2×6.13mm) has approx. 395% more face-up area than 0.15ct Diamond (Round, 3.45×3.45mm). In other words, it's 4.95x larger.


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