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30ct Topaz (Princess, 17.02×17.02mm, Blue) vs 30ct Quartz (Princess, 18.72×18.72mm, Brown)


Quick summary: When looked from above (face-up position), 30ct Quartz (18.72×18.72mm, princess cut) appears 21% larger than 30ct Topaz (17.02×17.02mm, princess cut). See below how they compare side-by-side on a ring and finger.

30ct Topaz (princess cut)
vs
 30ct Quartz (princess cut)
blue
 
brown
17.02×17.02 mm 18.72×18.72 mm
actual size
Actual size of 30ct Topaz (princess cut, 17.02×17.02mm, Blue color)   Actual size of 30ct Quartz (princess cut, 18.72×18.72mm, Brown color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 30ct Topaz (princess cut, 17.02×17.02mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Brown 30ct Quartz (princess cut, 18.72×18.72mm) 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
 101% vs 111%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 30ct Topaz Princess (17.02×17.02mm, Blue) and 30ct Quartz Princess (18.72×18.72mm, Brown) 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, Topaz will face-up smaller than Quartz for a given carat weight, because it has higher specific gravity (3.53 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.


30 Ct Topaz (Princess) 30 Ct Quartz (Princess)
17.02×17.02 mm vs 18.72×18.72 mm
289.68 mm²   350.44 mm²
Face-up size outline for 30ct Quartz (18.72×18.72mm, princess cut)
Face-up size outline for 30ct Topaz (17.02×17.02mm, princess cut)
30ct Topaz Princess (17.02×17.02mm)
30ct Quartz Princess (18.72×18.72mm)
Difference: 21% (60.76 mm²)
30ct Quartz (Princess, 18.72×18.72mm) has approx. 21% more face-up area than 30ct Topaz (Princess, 17.02×17.02mm).


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