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3.33ct Quartz (Round, 10×10mm, Orangey Red) vs 4ct Diamond (Round, 10.32×10.32mm, White)


Quick summary: When looked from above (face-up position), 4ct Diamond (10.32×10.32mm, round cut) appears 7% larger than 3.33ct Quartz (10×10mm, round cut). See below how they compare side-by-side on a ring and finger.

3.33ct Quartz (round cut)
vs
 4ct Diamond (round cut)
orangey red
 
white
10×10 mm 10.32×10.32 mm
actual size
Actual size of 3.33ct Quartz (round cut, 10×10mm, Orangey Red color)   Actual size of 4ct Diamond (round cut, 10.32×10.32mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Orangey Red 3.33ct Quartz (round cut, 10×10mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 4ct Diamond (round cut, 10.32×10.32mm) 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
 60% vs 62%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3.33ct Quartz Round (10×10mm, Orangey Red) and 4ct Diamond Round (10.32×10.32mm, 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, Diamond will face-up smaller than Quartz for a given carat weight, because it has higher specific gravity (3.52 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.


3.33 Ct Quartz (Round) 4 Ct Diamond (Round)
10×10 mm vs 10.32×10.32 mm
78.54 mm²   83.65 mm²
Face-up size outline for 4ct Diamond (10.32×10.32mm, round cut)
Face-up size outline for 3.33ct Quartz (10×10mm, round cut)
3.33ct Quartz Round (10×10mm)
4ct Diamond Round (10.32×10.32mm)
Difference: 7% (5.11 mm²)
4ct Diamond (Round, 10.32×10.32mm) has approx. 7% more face-up area than 3.33ct Quartz (Round, 10×10mm).


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