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2.3ct Diamond (Round, 8.58×8.58mm, White) vs 3.3ct Ruby (Round, 8.9×8.9mm, Red)


Quick summary: When looked from above (face-up position), 3.3ct Ruby (8.9×8.9mm, round cut) appears 8% larger than 2.3ct Diamond (8.58×8.58mm, round cut). See below how they compare side-by-side on a ring and finger.

2.3ct Diamond (round cut)
vs
 3.3ct Ruby (round cut)
white
 
red
8.58×8.58 mm 8.9×8.9 mm
actual size
Actual size of 2.3ct Diamond (round cut, 8.58×8.58mm, White color)   Actual size of 3.3ct Ruby (round cut, 8.9×8.9mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 2.3ct Diamond (round cut, 8.58×8.58mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 3.3ct Ruby (round cut, 8.9×8.9mm) 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
 51% vs 53%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 2.3ct Diamond Round (8.58×8.58mm, White) and 3.3ct Ruby Round (8.9×8.9mm, Red) 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.


2.3 Ct Diamond (Round) 3.3 Ct Ruby (Round)
8.58×8.58 mm vs 8.9×8.9 mm
57.82 mm²   62.21 mm²
Face-up size outline for 3.3ct Ruby (8.9×8.9mm, round cut)
Face-up size outline for 2.3ct Diamond (8.58×8.58mm, round cut)
2.3ct Diamond Round (8.58×8.58mm)
3.3ct Ruby Round (8.9×8.9mm)
Difference: 8% (4.39 mm²)
3.3ct Ruby (Round, 8.9×8.9mm) has approx. 8% more face-up area than 2.3ct Diamond (Round, 8.58×8.58mm).


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