18ct Topaz (Trillion, 19.97×19.97mm, Blue) vs 18ct Quartz (Trillion, 21.98×21.98mm, Brown)
Quick summary: When looked from above (face-up position), 18ct Quartz (21.98×21.98mm, trillion cut) appears 21% larger than 18ct Topaz (19.97×19.97mm, trillion cut). See below how they compare side-by-side on a ring and finger.
| 18ct Topaz (trillion cut) |
vs
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18ct Quartz (trillion cut) |
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blue |
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| 19.97×19.97 mm | 21.98×21.98 mm | |
| actual size | ||
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Actual size is set for screen
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Ring:
Skin tone:
Ring width: 3.0 mm
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64 mm |
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Actual sizes of
18ct Topaz Trillion (19.97×19.97mm, Blue)
and
18ct Quartz Trillion (21.98×21.98mm, 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.
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.
| 18 Ct Topaz (Trillion) | 18 Ct Quartz (Trillion) | |
| 19.97×19.97 mm | vs | 21.98×21.98 mm |
| 247.26 mm² | 299.53 mm² |
| 18ct Topaz Trillion (19.97×19.97mm) | |
| 18ct Quartz Trillion (21.98×21.98mm) | |
| Difference: 21% (52.27 mm²) |
18ct Quartz (Trillion, 21.98×21.98mm) has approx. 21% more face-up area than 18ct Topaz (Trillion, 19.97×19.97mm).
Popular comparisons:
- 7ct Topaz (Trillion, Bluish Green, 14.02 x 14.02) vs. 7ct Sapphire (Trillion, Bluish Green, 13.45 x 13.45)
- 9ct Topaz (Trillion, Bluish Green, 15.24 x 15.24) vs. 9ct Sapphire (Trillion, Bluish Green, 14.62 x 14.62)
- 5ct Topaz (Trillion, Bluish Green, 12.53 x 12.53) vs. 5ct Sapphire (Trillion, Bluish Green, 12.02 x 12.02)
- 6ct Topaz (Trillion, Blue, 13.32 x 13.32) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 8ct Topaz (Trillion, Bluish Green, 14.66 x 14.66) vs. 8ct Sapphire (Trillion, Bluish Green, 14.06 x 14.06)
- 2ct Topaz (Trillion, Blue, 9.23 x 9.23) vs. 2ct Tourmaline (Emerald, Violet, 8.76 x 6.49)
- 1ct Topaz (Trillion, Light Bluish Green, 7.33 x 7.33) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Topaz (Trillion, Blue, 7.33 x 7.33) vs. 1ct Topaz (Princess, Bluish Green, 6 x 6)
- 2.5ct Topaz (Trillion, Blue, 9.95 x 9.95) vs. 2ct Diamond (Trillion, White, 9.75 x 9.75)