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12ct Topaz (Oval, 18.3×12.2mm, Blue) vs 12ct Quartz (Oval, 20.13×13.42mm, Brown)


Quick summary: When looked from above (face-up position), 12ct Quartz (20.13×13.42mm, oval cut) appears 21% larger than 12ct Topaz (18.3×12.2mm, oval cut). See below how they compare side-by-side on a ring and finger.

12ct Topaz (oval cut)
vs
 12ct Quartz (oval cut)
blue
 
brown
18.3×12.2 mm 20.13×13.42 mm
actual size
Actual size of 12ct Topaz (oval cut, 18.3×12.2mm, Blue color)   Actual size of 12ct Quartz (oval cut, 20.13×13.42mm, Brown color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 12ct Topaz (oval cut, 18.3×12.2mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Brown 12ct Quartz (oval cut, 20.13×13.42mm) 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
 73% vs 80%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 12ct Topaz Oval (18.3×12.2mm, Blue) and 12ct Quartz Oval (20.13×13.42mm, 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.


12 Ct Topaz (Oval) 12 Ct Quartz (Oval)
18.3×12.2 mm vs 20.13×13.42 mm
183.07 mm²   221.52 mm²
Face-up size outline for 12ct Quartz (20.13×13.42mm, oval cut)
Face-up size outline for 12ct Topaz (18.3×12.2mm, oval cut)
12ct Topaz Oval (18.3×12.2mm)
12ct Quartz Oval (20.13×13.42mm)
Difference: 21% (38.45 mm²)
12ct Quartz (Oval, 20.13×13.42mm) has approx. 21% more face-up area than 12ct Topaz (Oval, 18.3×12.2mm).


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