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17ct Sapphire (Round, 15.37×15.37mm, Blue) vs 3ct Ruby (Round, 8.62×8.62mm, Red)


Quick summary: When looked from above (face-up position), 17ct Sapphire (15.37×15.37mm, round cut) appears 3.2 times larger than 3ct Ruby (8.62×8.62mm, round cut). See below how they compare side-by-side on a ring and finger.

17ct Sapphire (round cut)
vs
 3ct Ruby (round cut)
blue
 
red
15.37×15.37 mm 8.62×8.62 mm
actual size
Actual size of 17ct Sapphire (round cut, 15.37×15.37mm, Blue color)   Actual size of 3ct Ruby (round cut, 8.62×8.62mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 17ct Sapphire (round cut, 15.37×15.37mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 3ct Ruby (round cut, 8.62×8.62mm) 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
 91% vs 52%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 17ct Sapphire Round (15.37×15.37mm, Blue) and 3ct Ruby Round (8.62×8.62mm, 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

Sapphire and Ruby have the same specific gravity so their face-up size depends on the weight, shape and 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.


17 Ct Sapphire (Round) 3 Ct Ruby (Round)
15.37×15.37 mm vs 8.62×8.62 mm
185.54 mm²   58.36 mm²
Face-up size outline for 17ct Sapphire (15.37×15.37mm, round cut)
Face-up size outline for 3ct Ruby (8.62×8.62mm, round cut)
17ct Sapphire Round (15.37×15.37mm)
3ct Ruby Round (8.62×8.62mm)
Difference: 218% (127.18 mm²)
17ct Sapphire (Round, 15.37×15.37mm) has approx. 218% more face-up area than 3ct Ruby (Round, 8.62×8.62mm). In other words, it's 3.18x larger.


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