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0.4ct Ruby (Round, 4.4×4.4mm, Red) vs 0.2ct Diamond (Round, 3.8×3.8mm, White)


Quick summary: When looked from above (face-up position), 0.4ct Ruby (4.4×4.4mm, round cut) appears 34% larger than 0.2ct Diamond (3.8×3.8mm, round cut). See below how they compare side-by-side on a ring and finger.

0.4ct Ruby (round cut)
vs
 0.2ct Diamond (round cut)
red
 
white
4.4×4.4 mm 3.8×3.8 mm
actual size
Actual size of 0.4ct Ruby (round cut, 4.4×4.4mm, Red color)   Actual size of 0.2ct Diamond (round cut, 3.8×3.8mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.4ct Ruby (round cut, 4.4×4.4mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.2ct Diamond (round cut, 3.8×3.8mm) 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
 27% vs 23%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.4ct Ruby Round (4.4×4.4mm, Red) and 0.2ct Diamond Round (3.8×3.8mm, White) 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 Diamond for a given carat weight, because it has higher specific gravity (4 vs. 3.52 - this means it's "heavier" compared to Diamond 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.


0.4 Ct Ruby (Round) 0.2 Ct Diamond (Round)
4.4×4.4 mm vs 3.8×3.8 mm
15.21 mm²   11.34 mm²
Face-up size outline for 0.4ct Ruby (4.4×4.4mm, round cut)
Face-up size outline for 0.2ct Diamond (3.8×3.8mm, round cut)
0.4ct Ruby Round (4.4×4.4mm)
0.2ct Diamond Round (3.8×3.8mm)
Difference: 34% (3.87 mm²)
0.4ct Ruby (Round, 4.4×4.4mm) has approx. 34% more face-up area than 0.2ct Diamond (Round, 3.8×3.8mm).


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