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1.3ct Ruby (Cabochon, 7.47×4.98mm, Red) vs 1ct Diamond (Emerald, 6.68×4.95mm, White)


Quick summary: When looked from above (face-up position), 1ct Diamond (6.68×4.95mm, emerald cut) appears 0.8% larger than 1.3ct Ruby (7.47×4.98mm, cabochon cut). See below how they compare side-by-side on a ring and finger.

1.3ct Ruby (cabochon cut)
vs
 1ct Diamond (emerald cut)
red
 
white
7.47×4.98 mm 6.68×4.95 mm
actual size
Actual size of 1.3ct Ruby (cabochon cut, 7.47×4.98mm, Red color)   Actual size of 1ct Diamond (emerald cut, 6.68×4.95mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 1.3ct Ruby (cabochon cut, 7.47×4.98mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1ct Diamond (emerald cut, 6.68×4.95mm) 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
 30% vs 30%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.3ct Ruby Cabochon (7.47×4.98mm, Red) and 1ct Diamond Emerald (6.68×4.95mm, 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.


1.3 Ct Ruby (Cabochon) 1 Ct Diamond (Emerald)
7.47×4.98 mm vs 6.68×4.95 mm
30.5 mm²   30.75 mm²
Face-up size outline for 1ct Diamond (6.68×4.95mm, emerald cut)
Face-up size outline for 1.3ct Ruby (7.47×4.98mm, cabochon cut)
1.3ct Ruby Cabochon (7.47×4.98mm)
1ct Diamond Emerald (6.68×4.95mm)
Difference: 0.8% (0.25 mm²)
1ct Diamond (Emerald, 6.68×4.95mm) has approx. 0.8% more face-up area than 1.3ct Ruby (Cabochon, 7.47×4.98mm).


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