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4.5ct Ruby (Round, 9.87×9.87mm, Red) vs 3ct Quartz (Round, 9.89×9.89mm, Orangey Red)


Quick summary: When looked from above (face-up position), 3ct Quartz (9.89×9.89mm, round cut) appears 0.4% larger than 4.5ct Ruby (9.87×9.87mm, round cut). See below how they compare side-by-side on a ring and finger.

4.5ct Ruby (round cut)
vs
 3ct Quartz (round cut)
red
 
orangey red
9.87×9.87 mm 9.89×9.89 mm
actual size
Actual size of 4.5ct Ruby (round cut, 9.87×9.87mm, Red color)   Actual size of 3ct Quartz (round cut, 9.89×9.89mm, Orangey Red 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
Orangey Red 3ct Quartz (round cut, 9.89×9.89mm) 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 59%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4.5ct Ruby Round (9.87×9.87mm, Red) and 3ct Quartz Round (9.89×9.89mm, Orangey 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

All things being equal, Ruby will face-up smaller than Quartz for a given carat weight, because it has higher specific gravity (4 vs. 2.65 - this means it's "heavier" compared to Quartz 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.


4.5 Ct Ruby (Round) 3 Ct Quartz (Round)
9.87×9.87 mm vs 9.89×9.89 mm
76.51 mm²   76.82 mm²
Face-up size outline for 3ct Quartz (9.89×9.89mm, round cut)
Face-up size outline for 4.5ct Ruby (9.87×9.87mm, round cut)
4.5ct Ruby Round (9.87×9.87mm)
3ct Quartz Round (9.89×9.89mm)
Difference: 0.4% (0.31 mm²)
3ct Quartz (Round, 9.89×9.89mm) has approx. 0.4% more face-up area than 4.5ct Ruby (Round, 9.87×9.87mm).


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