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0.13ct Ruby (Round, 3.03×3.03mm, Red) vs 0.4ct Topaz (Round, 4.59×4.59mm, Blue)


Quick summary: When looked from above (face-up position), 0.4ct Topaz (4.59×4.59mm, round cut) appears 2.3 times larger than 0.13ct Ruby (3.03×3.03mm, round cut). See below how they compare side-by-side on a ring and finger.

0.13ct Ruby (round cut)
vs
 0.4ct Topaz (round cut)
red
 
blue
3.03×3.03 mm 4.59×4.59 mm
actual size
Actual size of 0.13ct Ruby (round cut, 3.03×3.03mm, Red color)   Actual size of 0.4ct Topaz (round cut, 4.59×4.59mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.13ct Ruby (round cut, 3.03×3.03mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.4ct Topaz (round cut, 4.59×4.59mm) 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
 18% vs 28%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.13ct Ruby Round (3.03×3.03mm, Red) and 0.4ct Topaz Round (4.59×4.59mm, 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, Ruby 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.


0.13 Ct Ruby (Round) 0.4 Ct Topaz (Round)
3.03×3.03 mm vs 4.59×4.59 mm
7.21 mm²   16.55 mm²
Face-up size outline for 0.4ct Topaz (4.59×4.59mm, round cut)
Face-up size outline for 0.13ct Ruby (3.03×3.03mm, round cut)
0.13ct Ruby Round (3.03×3.03mm)
0.4ct Topaz Round (4.59×4.59mm)
Difference: 130% (9.34 mm²)
0.4ct Topaz (Round, 4.59×4.59mm) has approx. 130% more face-up area than 0.13ct Ruby (Round, 3.03×3.03mm). In other words, it's 2.3x larger.


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