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0.99ct Diamond (Round, 6.48×6.48mm, White) vs 1.33ct Ruby (Cushion, 6.5×6.5mm, Red)


Quick summary: When looked from above (face-up position), 1.33ct Ruby (6.5×6.5mm, cushion cut) appears 15% larger than 0.99ct Diamond (6.48×6.48mm, round cut). See below how they compare side-by-side on a ring and finger.

0.99ct Diamond (round cut)
vs
 1.33ct Ruby (cushion cut)
white
 
red
6.48×6.48 mm 6.5×6.5 mm
actual size
Actual size of 0.99ct Diamond (round cut, 6.48×6.48mm, White color)   Actual size of 1.33ct Ruby (cushion cut, 6.5×6.5mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.99ct Diamond (round cut, 6.48×6.48mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 1.33ct Ruby (cushion cut, 6.5×6.5mm) 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
 39% vs 39%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.99ct Diamond Round (6.48×6.48mm, White) and 1.33ct Ruby Cushion (6.5×6.5mm, 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.


0.99 Ct Diamond (Round) 1.33 Ct Ruby (Cushion)
6.48×6.48 mm vs 6.5×6.5 mm
32.98 mm²   38.03 mm²
Face-up size outline for 1.33ct Ruby (6.5×6.5mm, cushion cut)
Face-up size outline for 0.99ct Diamond (6.48×6.48mm, round cut)
0.99ct Diamond Round (6.48×6.48mm)
1.33ct Ruby Cushion (6.5×6.5mm)
Difference: 15% (5.05 mm²)
1.33ct Ruby (Cushion, 6.5×6.5mm) has approx. 15% more face-up area than 0.99ct Diamond (Round, 6.48×6.48mm).


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