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7ct Ruby (Oval, 14.48×9.65mm, Red) vs 4ct Diamond (Oval, 12.89×8.59mm, White)


Quick summary: When looked from above (face-up position), 7ct Ruby (14.48×9.65mm, oval cut) appears 26% larger than 4ct Diamond (12.89×8.59mm, oval cut). See below how they compare side-by-side on a ring and finger.

7ct Ruby (oval cut)
vs
 4ct Diamond (oval cut)
red
 
white
14.48×9.65 mm 12.89×8.59 mm
actual size
Actual size of 7ct Ruby (oval cut, 14.48×9.65mm, Red color)   Actual size of 4ct Diamond (oval cut, 12.89×8.59mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 7ct Ruby (oval cut, 14.48×9.65mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 4ct Diamond (oval cut, 12.89×8.59mm) 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
 58% vs 51%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 7ct Ruby Oval (14.48×9.65mm, Red) and 4ct Diamond Oval (12.89×8.59mm, 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.


7 Ct Ruby (Oval) 4 Ct Diamond (Oval)
14.48×9.65 mm vs 12.89×8.59 mm
114.58 mm²   90.79 mm²
Face-up size outline for 7ct Ruby (14.48×9.65mm, oval cut)
Face-up size outline for 4ct Diamond (12.89×8.59mm, oval cut)
7ct Ruby Oval (14.48×9.65mm)
4ct Diamond Oval (12.89×8.59mm)
Difference: 26% (23.79 mm²)
7ct Ruby (Oval, 14.48×9.65mm) has approx. 26% more face-up area than 4ct Diamond (Oval, 12.89×8.59mm).


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