17ct Tourmaline (Round, 16.81×16.81mm, Purple) vs 17ct Quartz (Round, 17.63×17.63mm, Brown)
Quick summary: When looked from above (face-up position), 17ct Quartz (17.63×17.63mm, round cut) appears 10% larger than 17ct Tourmaline (16.81×16.81mm, round cut). See below how they compare side-by-side on a ring and finger.
| 17ct Tourmaline (round cut) |
vs
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17ct Quartz (round cut) |
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purple |
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| 16.81×16.81 mm | 17.63×17.63 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
17ct Tourmaline Round (16.81×16.81mm, Purple)
and
17ct Quartz Round (17.63×17.63mm, 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.
| 17 Ct Tourmaline (Round) | 17 Ct Quartz (Round) | |
| 16.81×16.81 mm | vs | 17.63×17.63 mm |
| 221.93 mm² | 244.12 mm² |
| 17ct Tourmaline Round (16.81×16.81mm) | |
| 17ct Quartz Round (17.63×17.63mm) | |
| Difference: 10% (22.19 mm²) |
17ct Quartz (Round, 17.63×17.63mm) has approx. 10% more face-up area than 17ct Tourmaline (Round, 16.81×16.81mm).
Popular comparisons:
- 1ct Tourmaline (Round, Light Green , 6.51 x 6.51) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1.5ct Tourmaline (Round, Light Red, 7.45 x 7.45) vs. 1.5ct Sapphire (Round, Light Blue, 6.84 x 6.84)
- 2ct Tourmaline (Round, Violet, 8.2 x 8.2) vs. 2ct Tourmaline (Oval, Violet, 10.38 x 6.92)
- 1ct Tourmaline (Round, Violet, 6.51 x 6.51) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 0.32ct Tourmaline (Round, Green, 4.45 x 4.45) vs. 0.3ct Sapphire (Round, Green, 4 x 4)
- 1.41ct Tourmaline (Round, Light Red, 7.3 x 7.3) vs. 1.58ct Tourmaline (Round, Light Red, 7.58 x 7.58)
- 0.3ct Tourmaline (Round, Violet, 4.36 x 4.36) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 2ct Tourmaline (Round, Violet, 8.2 x 8.2) vs. 2ct Diamond (Round, White, 8.19 x 8.19)
- 0.09ct Tourmaline (Round, Bluish Green, 2.81 x 2.81) vs. 0.09ct Diamond (Round, White, 2.81 x 2.81)