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8ct Topaz (Round, 12.47×12.47mm, Blue) vs 1ct Quartz (Round, 6.86×6.86mm, Orangey Red)


Quick summary: When looked from above (face-up position), 8ct Topaz (12.47×12.47mm, round cut) appears 3.3 times larger than 1ct Quartz (6.86×6.86mm, round cut). See below how they compare side-by-side on a ring and finger.

8ct Topaz (round cut)
vs
 1ct Quartz (round cut)
blue
 
orangey red
12.47×12.47 mm 6.86×6.86 mm
actual size
Actual size of 8ct Topaz (round cut, 12.47×12.47mm, Blue color)   Actual size of 1ct Quartz (round cut, 6.86×6.86mm, Orangey Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 8ct Topaz (round cut, 12.47×12.47mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Orangey Red 1ct Quartz (round cut, 6.86×6.86mm) 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
 74% vs 41%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Topaz Round (12.47×12.47mm, Blue) and 1ct Quartz Round (6.86×6.86mm, Orangey Red) 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.


8 Ct Topaz (Round) 1 Ct Quartz (Round)
12.47×12.47 mm vs 6.86×6.86 mm
122.13 mm²   36.96 mm²
Face-up size outline for 8ct Topaz (12.47×12.47mm, round cut)
Face-up size outline for 1ct Quartz (6.86×6.86mm, round cut)
8ct Topaz Round (12.47×12.47mm)
1ct Quartz Round (6.86×6.86mm)
Difference: 230% (85.17 mm²)
8ct Topaz (Round, 12.47×12.47mm) has approx. 230% more face-up area than 1ct Quartz (Round, 6.86×6.86mm). In other words, it's 3.3x larger.


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