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2.7ct Ruby (Round, 8.32×8.32mm, Red) vs 1.7ct Diamond (Round, 7.76×7.76mm, White)


Quick summary: When looked from above (face-up position), 2.7ct Ruby (8.32×8.32mm, round cut) appears 15% larger than 1.7ct Diamond (7.76×7.76mm, round cut). See below how they compare side-by-side on a ring and finger.

2.7ct Ruby (round cut)
vs
 1.7ct Diamond (round cut)
red
 
white
8.32×8.32 mm 7.76×7.76 mm
actual size
Actual size of 2.7ct Ruby (round cut, 8.32×8.32mm, Red color)   Actual size of 1.7ct Diamond (round cut, 7.76×7.76mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 2.7ct Ruby (round cut, 8.32×8.32mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1.7ct Diamond (round cut, 7.76×7.76mm) 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
 50% vs 46%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 2.7ct Ruby Round (8.32×8.32mm, Red) and 1.7ct Diamond Round (7.76×7.76mm, 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.


2.7 Ct Ruby (Round) 1.7 Ct Diamond (Round)
8.32×8.32 mm vs 7.76×7.76 mm
54.37 mm²   47.29 mm²
Face-up size outline for 2.7ct Ruby (8.32×8.32mm, round cut)
Face-up size outline for 1.7ct Diamond (7.76×7.76mm, round cut)
2.7ct Ruby Round (8.32×8.32mm)
1.7ct Diamond Round (7.76×7.76mm)
Difference: 15% (7.08 mm²)
2.7ct Ruby (Round, 8.32×8.32mm) has approx. 15% more face-up area than 1.7ct Diamond (Round, 7.76×7.76mm).


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