30ct Tourmaline (Cushion, 18.81×18.81mm, Purple) vs 30ct Quartz (Cushion, 19.73×19.73mm, Brown)
Quick summary: When looked from above (face-up position), 30ct Quartz (19.73×19.73mm, cushion cut) appears 10% larger than 30ct Tourmaline (18.81×18.81mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 30ct Tourmaline (cushion cut) |
vs
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30ct Quartz (cushion cut) |
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purple |
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| 18.81×18.81 mm | 19.73×19.73 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
30ct Tourmaline Cushion (18.81×18.81mm, Purple)
and
30ct Quartz Cushion (19.73×19.73mm, 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.
| 30 Ct Tourmaline (Cushion) | 30 Ct Quartz (Cushion) | |
| 18.81×18.81 mm | vs | 19.73×19.73 mm |
| 318.43 mm² | 350.35 mm² |
| 30ct Tourmaline Cushion (18.81×18.81mm) | |
| 30ct Quartz Cushion (19.73×19.73mm) | |
| Difference: 10% (31.92 mm²) |
30ct Quartz (Cushion, 19.73×19.73mm) has approx. 10% more face-up area than 30ct Tourmaline (Cushion, 18.81×18.81mm).
Popular comparisons:
- 5.8ct Tourmaline (Cushion, Dark Green, 10.69 x 10.69) vs. 6.53ct Sapphire (Pear, Dark Green, 12.83 x 9.31)
- 1ct Tourmaline (Cushion, Violet, 6.09 x 6.09) vs. 1ct Tourmaline (Emerald, Violet, 6.95 x 5.15)
- 3.9ct Tourmaline (Cushion, Light Yellow, 9.58 x 9.58) vs. 6.3ct Tourmaline (Cushion, Light Yellow, 11.24 x 11.24)
- 6ct Tourmaline (Cushion, Light Yellow, 11.06 x 11.06) vs. 3ct Chrysoberyl (Cushion, Light Yellowish Green, 8.28 x 8.28)
- 5.5ct Tourmaline (Cushion, Dark Bluish Green, 10.75 x 10.75) vs. 1.5ct Sapphire (Round, Light Blue, 6.84 x 6.84)
- 7.56ct Tourmaline (Cushion, Dark Green, 10.69 x 10.69) vs. 8.8ct Tourmaline (Oval, Dark Yellowish Green, 15.22 x 11.45)
- 3.9ct Tourmaline (Cushion, Light Yellow, 9.58 x 9.58) vs. 3.6ct Diamond (Cushion, White, 8.93 x 8.93)
- 6ct Tourmaline (Cushion, Light Yellow, 11.06 x 11.06) vs. 3.6ct Diamond (Cushion, White, 8.93 x 8.93)
- 3.87ct Tourmaline (Cushion, Green, 10.08 x 8.15) vs. 5.18ct Tourmaline (Oval, Dark Green, 13 x 10.5)