30ct Topaz (Cushion, 17.93×17.93mm, Blue) 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 21% larger than 30ct Topaz (17.93×17.93mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 30ct Topaz (cushion cut) |
vs
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30ct Quartz (cushion cut) |
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blue |
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| 17.93×17.93 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 Topaz Cushion (17.93×17.93mm, Blue)
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, 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.
| 30 Ct Topaz (Cushion) | 30 Ct Quartz (Cushion) | |
| 17.93×17.93 mm | vs | 19.73×19.73 mm |
| 289.34 mm² | 350.35 mm² |
| 30ct Topaz Cushion (17.93×17.93mm) | |
| 30ct Quartz Cushion (19.73×19.73mm) | |
| Difference: 21% (61.01 mm²) |
30ct Quartz (Cushion, 19.73×19.73mm) has approx. 21% more face-up area than 30ct Topaz (Cushion, 17.93×17.93mm).
Popular comparisons:
- 4ct Topaz (Cushion, Blue, 10 x 10) vs. 4ct Topaz (Round, Blue, 11 x 11)
- 28ct Topaz (Cushion, Blue, 17.7 x 17.7) vs. 28ct Diamond (Cushion, White, 17.69 x 17.69)
- 4ct Topaz (Cushion, Bluish Green, 9.25 x 9.25) vs. 7ct Topaz (Cushion, Bluish Green, 11.15 x 11.15)
- 2ct Topaz (Cushion, Light Bluish Green, 7.34 x 7.34) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 2.5ct Topaz (Cushion, Blue, 7.91 x 7.91) vs. 1.2ct Topaz (Cushion, Blue, 6.19 x 6.19)
- 2.5ct Topaz (Cushion, Dark Violet, 7.91 x 7.91) vs. 1.5ct Diamond (Round, White, 7.44 x 7.44)
- 4.9ct Topaz (Cushion, Blue, 9.9 x 9.9) vs. 3.66ct Amethyst (Cushion, Violet, 9.88 x 9.88)
- 2ct Topaz (Cushion, Blue, 7.34 x 7.34) vs. 1ct Topaz (Cushion, Blue, 5.83 x 5.83)
- 4.2ct Topaz (Cushion, Blue, 9.41 x 9.41) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)