×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

7.5ct Sapphire (Emerald, 12.5×9.26mm, Blue) vs 7.5ct Topaz (Emerald, 13.03×9.65mm, Blue)


Quick summary: When looked from above (face-up position), 7.5ct Topaz (13.03×9.65mm, emerald cut) appears 9% larger than 7.5ct Sapphire (12.5×9.26mm, emerald cut). See below how they compare side-by-side on a ring and finger.

7.5ct Sapphire (emerald cut)
vs
 7.5ct Topaz (emerald cut)
blue
 
blue
12.5×9.26 mm 13.03×9.65 mm
actual size
Actual size of 7.5ct Sapphire (emerald cut, 12.5×9.26mm, Blue color)   Actual size of 7.5ct Topaz (emerald cut, 13.03×9.65mm, 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 (emerald cut, 12.5×9.26mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 7.5ct Topaz (emerald cut, 13.03×9.65mm) 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
 55% vs 58%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 7.5ct Sapphire Emerald (12.5×9.26mm, Blue) and 7.5ct Topaz Emerald (13.03×9.65mm, 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 (Emerald) 7.5 Ct Topaz (Emerald)
12.5×9.26 mm vs 13.03×9.65 mm
107.65 mm²   116.94 mm²
Face-up size outline for 7.5ct Topaz (13.03×9.65mm, emerald cut)
Face-up size outline for 7.5ct Sapphire (12.5×9.26mm, emerald cut)
7.5ct Sapphire Emerald (12.5×9.26mm)
7.5ct Topaz Emerald (13.03×9.65mm)
Difference: 9% (9.29 mm²)
7.5ct Topaz (Emerald, 13.03×9.65mm) has approx. 9% more face-up area than 7.5ct Sapphire (Emerald, 12.5×9.26mm).


Popular comparisons: