30ct Fluorite (Cushion, 18.57×18.57mm, Bluish Green) vs 30ct Topaz (Cushion, 17.93×17.93mm, Blue)
Quick summary: When looked from above (face-up position), 30ct Fluorite (18.57×18.57mm, cushion cut) appears 7% larger than 30ct Topaz (17.93×17.93mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 30ct Fluorite (cushion cut) |
vs
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30ct Topaz (cushion cut) |
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bluish green |
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| 18.57×18.57 mm | 17.93×17.93 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 Fluorite Cushion (18.57×18.57mm, Bluish Green)
and
30ct Topaz Cushion (17.93×17.93mm, Blue)
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 Fluorite for a given
carat weight, because it has higher specific gravity
(3.53 vs. 3.18 - this means it's "heavier" compared to Fluorite 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 Fluorite (Cushion) | 30 Ct Topaz (Cushion) | |
| 18.57×18.57 mm | vs | 17.93×17.93 mm |
| 310.36 mm² | 289.34 mm² |
| 30ct Fluorite Cushion (18.57×18.57mm) | |
| 30ct Topaz Cushion (17.93×17.93mm) | |
| Difference: 7% (21.02 mm²) |
30ct Fluorite (Cushion, 18.57×18.57mm) has approx. 7% more face-up area than 30ct Topaz (Cushion, 17.93×17.93mm).
Popular comparisons:
- 6ct Fluorite (Cushion, Bluish Green, 10.97 x 10.97) vs. 6ct Sapphire (Round, Blue, 11.2 x 11.2)
- 6ct Fluorite (Cushion, Bluish Green, 10.97 x 10.97) vs. 6ct Sapphire (Round, Blue, 11.1 x 11.1)
- 5ct Fluorite (Cushion, Bluish Green, 10.32 x 10.32) vs. 5ct Benitoite (Emerald, Blue, 11.26 x 8.34)
- 40ct Fluorite (Cushion, Green, 20.64 x 20.64) vs. 40ct Emerald (Emerald, Green, 24.89 x 18.44)
- 2ct Fluorite (Cushion, Bluish Green, 7.6 x 7.6) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 17ct Fluorite (Cushion, Bluish Green, 15.36 x 15.36) vs. 17ct Topaz (Cushion, Blue, 14.84 x 14.84)
- 4ct Fluorite (Cushion, Bluish Green, 9.58 x 9.58) vs. 4ct Hiddenite (Pear, Light Green , 14.23 x 8.57)
- 1ct Fluorite (Cushion, Light Gray, 5.98 x 5.98) vs. 1ct Emerald (Emerald, Green, 7.26 x 5.38)
- 2.7ct Ruby (Pear, Red, 10 x 7) vs. 3ct Ruby (Emerald, Red, 9 x 7)