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4.5ct Ruby (Round, 9.87×9.87mm, Red) vs 3.75ct Sapphire (Round, 9.29×9.29mm, Blue)


Quick summary: When looked from above (face-up position), 4.5ct Ruby (9.87×9.87mm, round cut) appears 13% larger than 3.75ct Sapphire (9.29×9.29mm, round cut). See below how they compare side-by-side on a ring and finger.

4.5ct Ruby (round cut)
vs
 3.75ct Sapphire (round cut)
red
 
blue
9.87×9.87 mm 9.29×9.29 mm
actual size
Actual size of 4.5ct Ruby (round cut, 9.87×9.87mm, Red color)   Actual size of 3.75ct Sapphire (round cut, 9.29×9.29mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 4.5ct Ruby (round cut, 9.87×9.87mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 3.75ct Sapphire (round cut, 9.29×9.29mm) 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
 59% vs 55%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4.5ct Ruby Round (9.87×9.87mm, Red) and 3.75ct Sapphire Round (9.29×9.29mm, Blue) 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

Ruby and Sapphire 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.


4.5 Ct Ruby (Round) 3.75 Ct Sapphire (Round)
9.87×9.87 mm vs 9.29×9.29 mm
76.51 mm²   67.78 mm²
Face-up size outline for 4.5ct Ruby (9.87×9.87mm, round cut)
Face-up size outline for 3.75ct Sapphire (9.29×9.29mm, round cut)
4.5ct Ruby Round (9.87×9.87mm)
3.75ct Sapphire Round (9.29×9.29mm)
Difference: 13% (8.73 mm²)
4.5ct Ruby (Round, 9.87×9.87mm) has approx. 13% more face-up area than 3.75ct Sapphire (Round, 9.29×9.29mm).


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