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31.5ct Quartz (Princess, 19.47×19.47mm, Yellow) vs 1ct Diamond (Round, 6.5×6.5mm, White)


Quick summary: When looked from above (face-up position), 31.5ct Quartz (19.47×19.47mm, princess cut) appears 11.4 times larger than 1ct Diamond (6.5×6.5mm, round cut). See below how they compare side-by-side on a ring and finger.

31.5ct Quartz (princess cut)
vs
 1ct Diamond (round cut)
yellow
 
white
19.47×19.47 mm 6.5×6.5 mm
actual size
Actual size of 31.5ct Quartz (princess cut, 19.47×19.47mm, Yellow color)   Actual size of 1ct Diamond (round cut, 6.5×6.5mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Yellow 31.5ct Quartz (princess cut, 19.47×19.47mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1ct Diamond (round cut, 6.5×6.5mm) 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
 116% vs 39%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 31.5ct Quartz Princess (19.47×19.47mm, Yellow) and 1ct Diamond Round (6.5×6.5mm, 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.


31.5 Ct Quartz (Princess) 1 Ct Diamond (Round)
19.47×19.47 mm vs 6.5×6.5 mm
379.08 mm²   33.18 mm²
Face-up size outline for 31.5ct Quartz (19.47×19.47mm, princess cut)
Face-up size outline for 1ct Diamond (6.5×6.5mm, round cut)
31.5ct Quartz Princess (19.47×19.47mm)
1ct Diamond Round (6.5×6.5mm)
Difference: 1042% (345.9 mm²)
31.5ct Quartz (Princess, 19.47×19.47mm) has approx. 1042% more face-up area than 1ct Diamond (Round, 6.5×6.5mm). In other words, it's 11.42x larger.


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