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1ct Topaz (Round, 6×6mm, Blue) vs 0.5ct Sapphire (Round, 4.75×4.75mm, Blue)


Quick summary: When looked from above (face-up position), 1ct Topaz (6×6mm, round cut) appears 60% larger than 0.5ct Sapphire (4.75×4.75mm, round cut). See below how they compare side-by-side on a ring and finger.

1ct Topaz (round cut)
vs
 0.5ct Sapphire (round cut)
blue
 
blue
6×6 mm 4.75×4.75 mm
actual size
Actual size of 1ct Topaz (round cut, 6×6mm, Blue color)   Actual size of 0.5ct Sapphire (round cut, 4.75×4.75mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1ct Topaz (round cut, 6×6mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.5ct Sapphire (round cut, 4.75×4.75mm) 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
 36% vs 29%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Topaz Round (6×6mm, Blue) and 0.5ct Sapphire Round (4.75×4.75mm, 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.


1 Ct Topaz (Round) 0.5 Ct Sapphire (Round)
6×6 mm vs 4.75×4.75 mm
28.27 mm²   17.72 mm²
Face-up size outline for 1ct Topaz (6×6mm, round cut)
Face-up size outline for 0.5ct Sapphire (4.75×4.75mm, round cut)
1ct Topaz Round (6×6mm)
0.5ct Sapphire Round (4.75×4.75mm)
Difference: 60% (10.55 mm²)
1ct Topaz (Round, 6×6mm) has approx. 60% more face-up area than 0.5ct Sapphire (Round, 4.75×4.75mm).


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