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10ct Diamond (Oval, 17.49×11.66mm, White) vs 15ct Sapphire (Oval, 18.66×12.44mm, Blue)


Quick summary: When looked from above (face-up position), 15ct Sapphire (18.66×12.44mm, oval cut) appears 14% larger than 10ct Diamond (17.49×11.66mm, oval cut). See below how they compare side-by-side on a ring and finger.

10ct Diamond (oval cut)
vs
 15ct Sapphire (oval cut)
white
 
blue
17.49×11.66 mm 18.66×12.44 mm
actual size
Actual size of 10ct Diamond (oval cut, 17.49×11.66mm, White color)   Actual size of 15ct Sapphire (oval cut, 18.66×12.44mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 10ct Diamond (oval cut, 17.49×11.66mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 15ct Sapphire (oval cut, 18.66×12.44mm) 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
 69% vs 74%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 10ct Diamond Oval (17.49×11.66mm, White) and 15ct Sapphire Oval (18.66×12.44mm, 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.


10 Ct Diamond (Oval) 15 Ct Sapphire (Oval)
17.49×11.66 mm vs 18.66×12.44 mm
167.23 mm²   190.35 mm²
Face-up size outline for 15ct Sapphire (18.66×12.44mm, oval cut)
Face-up size outline for 10ct Diamond (17.49×11.66mm, oval cut)
10ct Diamond Oval (17.49×11.66mm)
15ct Sapphire Oval (18.66×12.44mm)
Difference: 14% (23.12 mm²)
15ct Sapphire (Oval, 18.66×12.44mm) has approx. 14% more face-up area than 10ct Diamond (Oval, 17.49×11.66mm).


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