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9ct Ruby (Oval, 15.74×10.49mm, Red) vs 10ct Diamond (Pear, 19.49×11.74mm, White)


Quick summary: When looked from above (face-up position), 10ct Diamond (19.49×11.74mm, pear cut) appears 23% larger than 9ct Ruby (15.74×10.49mm, oval cut). See below how they compare side-by-side on a ring and finger.

9ct Ruby (oval cut)
vs
 10ct Diamond (pear cut)
red
 
white
15.74×10.49 mm 19.49×11.74 mm
actual size
Actual size of 9ct Ruby (oval cut, 15.74×10.49mm, Red color)   Actual size of 10ct Diamond (pear cut, 19.49×11.74mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 9ct Ruby (oval cut, 15.74×10.49mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 10ct Diamond (pear cut, 19.49×11.74mm) 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
 63% vs 70%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 9ct Ruby Oval (15.74×10.49mm, Red) and 10ct Diamond Pear (19.49×11.74mm, 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.


9 Ct Ruby (Oval) 10 Ct Diamond (Pear)
15.74×10.49 mm vs 19.49×11.74 mm
135.39 mm²   167.03 mm²
Face-up size outline for 10ct Diamond (19.49×11.74mm, pear cut)
Face-up size outline for 9ct Ruby (15.74×10.49mm, oval cut)
9ct Ruby Oval (15.74×10.49mm)
10ct Diamond Pear (19.49×11.74mm)
Difference: 23% (31.64 mm²)
10ct Diamond (Pear, 19.49×11.74mm) has approx. 23% more face-up area than 9ct Ruby (Oval, 15.74×10.49mm).


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