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10ct Sapphire (Cabochon, 14.75×9.83mm, Blue) vs 10ct Topaz (Cabochon, 15.38×10.25mm, Blue)


Quick summary: When looked from above (face-up position), 10ct Topaz (15.38×10.25mm, cabochon cut) appears 9% larger than 10ct Sapphire (14.75×9.83mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

10ct Sapphire (cabochon cut)
vs
 10ct Topaz (cabochon cut)
blue
 
blue
14.75×9.83 mm 15.38×10.25 mm
actual size
Actual size of 10ct Sapphire (cabochon cut, 14.75×9.83mm, Blue color)   Actual size of 10ct Topaz (cabochon cut, 15.38×10.25mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 10ct Sapphire (cabochon cut, 14.75×9.83mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 10ct Topaz (cabochon cut, 15.38×10.25mm) 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
 59% vs 61%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 10ct Sapphire Cabochon (14.75×9.83mm, Blue) and 10ct Topaz Cabochon (15.38×10.25mm, 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.


10 Ct Sapphire (Cabochon) 10 Ct Topaz (Cabochon)
14.75×9.83 mm vs 15.38×10.25 mm
118.89 mm²   129.27 mm²
Face-up size outline for 10ct Topaz (15.38×10.25mm, cabochon cut)
Face-up size outline for 10ct Sapphire (14.75×9.83mm, cabochon cut)
10ct Sapphire Cabochon (14.75×9.83mm)
10ct Topaz Cabochon (15.38×10.25mm)
Difference: 9% (10.38 mm²)
10ct Topaz (Cabochon, 15.38×10.25mm) has approx. 9% more face-up area than 10ct Sapphire (Cabochon, 14.75×9.83mm).


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