18ct Tourmaline (Princess, 15.05×15.05mm, Purple) vs 18ct Quartz (Princess, 15.79×15.79mm, Brown)
Quick summary: When looked from above (face-up position), 18ct Quartz (15.79×15.79mm, princess cut) appears 10% larger than 18ct Tourmaline (15.05×15.05mm, princess cut). See below how they compare side-by-side on a ring and finger.
| 18ct Tourmaline (princess cut) |
vs
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18ct Quartz (princess cut) |
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purple |
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| 15.05×15.05 mm | 15.79×15.79 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 Tourmaline Princess (15.05×15.05mm, Purple)
and
18ct Quartz Princess (15.79×15.79mm, 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, Tourmaline will face-up smaller than Quartz for a given
carat weight, because it has higher specific gravity
(3.06 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 Tourmaline (Princess) | 18 Ct Quartz (Princess) | |
| 15.05×15.05 mm | vs | 15.79×15.79 mm |
| 226.5 mm² | 249.32 mm² |
| 18ct Tourmaline Princess (15.05×15.05mm) | |
| 18ct Quartz Princess (15.79×15.79mm) | |
| Difference: 10% (22.82 mm²) |
18ct Quartz (Princess, 15.79×15.79mm) has approx. 10% more face-up area than 18ct Tourmaline (Princess, 15.05×15.05mm).
Popular comparisons:
- 15ct Tourmaline (Princess, Light Red, 14.43 x 14.43) vs. 1ct Amethyst (Princess, Violet, 6.17 x 6.17)
- 2.07ct Tourmaline (Princess, Bluish Green, 8.3 x 8.3) vs. 2.07ct Tourmaline (Princess, Bluish Green, 8 x 8)
- 1.2ct Tourmaline (Princess, Dark Green, 6.22 x 6.22) vs. 0.71ct Tourmaline (Princess, Dark Green, 5.22 x 5.22)
- 0.2ct Tourmaline (Princess, Purple, 3.42 x 3.42) vs. 0.2ct Morganite (Princess, Light Red, 3.58 x 3.58)
- 2.5ct Tourmaline (Princess, Bluish Green, 7.94 x 7.94) vs. 2.27ct Tourmaline (Princess, Bluish Green, 7.69 x 7.69)
- 2.5ct Tourmaline (Princess, Light Red, 7.94 x 7.94) vs. 1ct Sapphire (Princess, Blue, 5.37 x 5.37)
- 2ct Tourmaline (Princess, Blue, 7.37 x 7.37) vs. 2ct Tourmaline (Asscher, Blue, 7.35 x 7.35)
- 0.91ct Tourmaline (Princess, Light Red, 6.3 x 6.3) vs. 1ct Tourmaline (Princess, Light Bluish Green, 6.6 x 6.6)
- 1ct Tourmaline (Princess, Light Green , 5.85 x 5.85) vs. 1ct Diamond (Princess, White, 5.51 x 5.51)