0.18ct Topaz (Pear, 4.9×2.95mm, Blue) vs 1.5ct Tanzanite (Cushion, 6.82×6.82mm, Blue)
Quick summary: When looked from above (face-up position), 1.5ct Tanzanite (6.82×6.82mm, cushion cut) appears 4 times larger than 0.18ct Topaz (4.9×2.95mm, pear cut). See below how they compare side-by-side on a ring and finger.
| 0.18ct Topaz (pear cut) |
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1.5ct Tanzanite (cushion cut) |
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blue |
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| 4.9×2.95 mm | 6.82×6.82 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
0.18ct Topaz Pear (4.9×2.95mm, Blue)
and
1.5ct Tanzanite Cushion (6.82×6.82mm, 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 Tanzanite for a given
carat weight, because it has higher specific gravity
(3.53 vs. 3.35 - this means it's "heavier" compared to Tanzanite 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.
| 0.18 Ct Topaz (Pear) | 1.5 Ct Tanzanite (Cushion) | |
| 4.9×2.95 mm | vs | 6.82×6.82 mm |
| 10.55 mm² | 41.86 mm² |
| 0.18ct Topaz Pear (4.9×2.95mm) | |
| 1.5ct Tanzanite Cushion (6.82×6.82mm) | |
| Difference: 297% (31.31 mm²) |
1.5ct Tanzanite (Cushion, 6.82×6.82mm) has approx. 297% more face-up area than 0.18ct Topaz (Pear, 4.9×2.95mm). In other words, it's 3.97x larger.
Popular comparisons:
- 0.18ct Topaz (Pear, Blue, 4.9 x 2.95) vs. 1ct Topaz (Pear, Blue, 8.67 x 5.22)
- 0.18ct Topaz (Pear, Blue, 4.9 x 2.95) vs. 0.95ct Tanzanite (Round, Blue, 6.27 x 6.27)
- 0.18ct Topaz (Pear, Blue, 4.9 x 2.95) vs. 0.14ct Amethyst (Pear, Violet, 4.95 x 2.98)
- 26ct Topaz (Pear, Bluish Green, 25.65 x 15.45) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 40ct Topaz (Pear, Blue, 29.61 x 17.84) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1.5ct Topaz (Pear, Blue, 9.91 x 5.97) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 40ct Topaz (Pear, Blue, 29.61 x 17.84) vs. 20ct Topaz (Trillion, Blue, 19.89 x 19.89)
- 2ct Topaz (Pear, Blue, 10.91 x 6.57) vs. 2ct Topaz (Round, Blue, 7.85 x 7.85)