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7.5ct Sapphire (Radiant, 10.78×10.78mm, Blue) vs 7.5ct Topaz (Radiant, 11.24×11.24mm, Blue)


Quick summary: When looked from above (face-up position), 7.5ct Topaz (11.24×11.24mm, radiant cut) appears 9% larger than 7.5ct Sapphire (10.78×10.78mm, radiant cut). See below how they compare side-by-side on a ring and finger.

7.5ct Sapphire (radiant cut)
vs
 7.5ct Topaz (radiant cut)
blue
 
blue
10.78×10.78 mm 11.24×11.24 mm
actual size
Actual size of 7.5ct Sapphire (radiant cut, 10.78×10.78mm, Blue color)   Actual size of 7.5ct Topaz (radiant cut, 11.24×11.24mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 7.5ct Sapphire (radiant cut, 10.78×10.78mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 7.5ct Topaz (radiant cut, 11.24×11.24mm) 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
 64% vs 67%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 7.5ct Sapphire Radiant (10.78×10.78mm, Blue) and 7.5ct Topaz Radiant (11.24×11.24mm, 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.


7.5 Ct Sapphire (Radiant) 7.5 Ct Topaz (Radiant)
10.78×10.78 mm vs 11.24×11.24 mm
110.4 mm²   120.02 mm²
Face-up size outline for 7.5ct Topaz (11.24×11.24mm, radiant cut)
Face-up size outline for 7.5ct Sapphire (10.78×10.78mm, radiant cut)
7.5ct Sapphire Radiant (10.78×10.78mm)
7.5ct Topaz Radiant (11.24×11.24mm)
Difference: 9% (9.62 mm²)
7.5ct Topaz (Radiant, 11.24×11.24mm) has approx. 9% more face-up area than 7.5ct Sapphire (Radiant, 10.78×10.78mm).


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