18ct Tourmaline (Oval, 21.98×14.65mm, Purple) vs 18ct Quartz (Oval, 23.06×15.37mm, Brown)
Quick summary: When looked from above (face-up position), 18ct Quartz (23.06×15.37mm, oval cut) appears 10% larger than 18ct Tourmaline (21.98×14.65mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 18ct Tourmaline (oval cut) |
vs
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18ct Quartz (oval cut) |
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purple |
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| 21.98×14.65 mm | 23.06×15.37 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 Oval (21.98×14.65mm, Purple)
and
18ct Quartz Oval (23.06×15.37mm, 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 (Oval) | 18 Ct Quartz (Oval) | |
| 21.98×14.65 mm | vs | 23.06×15.37 mm |
| 264.05 mm² | 290.63 mm² |
| 18ct Tourmaline Oval (21.98×14.65mm) | |
| 18ct Quartz Oval (23.06×15.37mm) | |
| Difference: 10% (26.58 mm²) |
18ct Quartz (Oval, 23.06×15.37mm) has approx. 10% more face-up area than 18ct Tourmaline (Oval, 21.98×14.65mm).
Popular comparisons:
- 5.8ct Tourmaline (Oval, Violet, 14.79 x 9.86) vs. 8ct Sapphire (Oval, Blue, 15.12 x 10.08)
- 14ct Tourmaline (Oval, Light Purple, 19.85 x 14) vs. 14ct Kunzite (Oval, Light Purple, 19.68 x 14)
- 3ct Tourmaline (Oval, White, 11.88 x 7.92) vs. 4.5ct Diamond (Oval, White, 13.4 x 8.93)
- 2.84ct Tourmaline (Oval, Violet, 11.66 x 7.77) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 8.8ct Tourmaline (Oval, Dark Yellowish Green, 15.22 x 11.45) vs. 6.54ct Sapphire (Pear, Dark Green, 12.83 x 9.31)
- 1ct Tourmaline (Oval, Red, 8.24 x 5.49) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 2.89ct Tourmaline (Oval, Red, 10.74 x 7.74) vs. 0.49ct Ruby (Oval, Red, 4.96 x 3.96)
- 3.5ct Tourmaline (Oval, Light Green , 12.5 x 8.33) vs. 3.5ct Diamond (Round, White, 9.87 x 9.87)
- 1ct Tourmaline (Oval, Violet, 8.24 x 5.49) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)