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4.5ct Sapphire (Oval, 12.66×8.44mm, Blue) vs 4.5ct Topaz (Oval, 13.2×8.8mm, Blue)


Quick summary: When looked from above (face-up position), 4.5ct Topaz (13.2×8.8mm, oval cut) appears 9% larger than 4.5ct Sapphire (12.66×8.44mm, oval cut). See below how they compare side-by-side on a ring and finger.

4.5ct Sapphire (oval cut)
vs
 4.5ct Topaz (oval cut)
blue
 
blue
12.66×8.44 mm 13.2×8.8 mm
actual size
Actual size of 4.5ct Sapphire (oval cut, 12.66×8.44mm, Blue color)   Actual size of 4.5ct Topaz (oval cut, 13.2×8.8mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 4.5ct Sapphire (oval cut, 12.66×8.44mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 4.5ct Topaz (oval cut, 13.2×8.8mm) 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
 50% vs 53%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 4.5ct Sapphire Oval (12.66×8.44mm, Blue) and 4.5ct Topaz Oval (13.2×8.8mm, 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 Topaz for a given carat weight, because it has higher specific gravity (4 vs. 3.53 - this means it's "heavier" compared to Topaz 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.


4.5 Ct Sapphire (Oval) 4.5 Ct Topaz (Oval)
12.66×8.44 mm vs 13.2×8.8 mm
87.62 mm²   95.25 mm²
Face-up size outline for 4.5ct Topaz (13.2×8.8mm, oval cut)
Face-up size outline for 4.5ct Sapphire (12.66×8.44mm, oval cut)
4.5ct Sapphire Oval (12.66×8.44mm)
4.5ct Topaz Oval (13.2×8.8mm)
Difference: 9% (7.63 mm²)
4.5ct Topaz (Oval, 13.2×8.8mm) has approx. 9% more face-up area than 4.5ct Sapphire (Oval, 12.66×8.44mm).


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