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15ct Topaz (Trillion, 18.8×18.8mm, Blue) vs 15ct Quartz (Trillion, 20.68×20.68mm, Brown)


Quick summary: When looked from above (face-up position), 15ct Quartz (20.68×20.68mm, trillion cut) appears 21% larger than 15ct Topaz (18.8×18.8mm, trillion cut). See below how they compare side-by-side on a ring and finger.

15ct Topaz (trillion cut)
vs
 15ct Quartz (trillion cut)
blue
 
brown
18.8×18.8 mm 20.68×20.68 mm
actual size
Actual size of 15ct Topaz (trillion cut, 18.8×18.8mm, Blue color)   Actual size of 15ct Quartz (trillion cut, 20.68×20.68mm, Brown color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 15ct Topaz (trillion cut, 18.8×18.8mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Brown 15ct Quartz (trillion cut, 20.68×20.68mm) 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
 112% vs 123%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 15ct Topaz Trillion (18.8×18.8mm, Blue) and 15ct Quartz Trillion (20.68×20.68mm, 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.


15 Ct Topaz (Trillion) 15 Ct Quartz (Trillion)
18.8×18.8 mm vs 20.68×20.68 mm
219.13 mm²   265.15 mm²
Face-up size outline for 15ct Quartz (20.68×20.68mm, trillion cut)
Face-up size outline for 15ct Topaz (18.8×18.8mm, trillion cut)
15ct Topaz Trillion (18.8×18.8mm)
15ct Quartz Trillion (20.68×20.68mm)
Difference: 21% (46.02 mm²)
15ct Quartz (Trillion, 20.68×20.68mm) has approx. 21% more face-up area than 15ct Topaz (Trillion, 18.8×18.8mm).


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