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4ct Topaz (Round, 9.89×9.89mm, Blue) vs 8ct Topaz (Round, 12.47×12.47mm, Blue)


Quick summary: When looked from above (face-up position), 8ct Topaz (12.47×12.47mm, round cut) appears 59% larger than 4ct Topaz (9.89×9.89mm, round cut). See below how they compare side-by-side on a ring and finger.

4ct Topaz (round cut)
vs
 8ct Topaz (round cut)
blue
 
blue
9.89×9.89 mm 12.47×12.47 mm
actual size
Actual size of 4ct Topaz (round cut, 9.89×9.89mm, Blue color)   Actual size of 8ct Topaz (round cut, 12.47×12.47mm, Blue color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 4ct Topaz (round cut, 9.89×9.89mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 8ct Topaz (round cut, 12.47×12.47mm) 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 74%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Topaz Round (9.89×9.89mm, Blue) and 8ct Topaz Round (12.47×12.47mm, 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

The face-up size depends on the shape of the gem, its weight and 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 Ct Topaz (Round) 8 Ct Topaz (Round)
9.89×9.89 mm vs 12.47×12.47 mm
76.82 mm²   122.13 mm²
Face-up size outline for 8ct Topaz (12.47×12.47mm, round cut)
Face-up size outline for 4ct Topaz (9.89×9.89mm, round cut)
4ct Topaz Round (9.89×9.89mm)
8ct Topaz Round (12.47×12.47mm)
Difference: 59% (45.31 mm²)
8ct Topaz (Round, 12.47×12.47mm) has approx. 59% more face-up area than 4ct Topaz (Round, 9.89×9.89mm).


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