1ct Alexandrite (Marquise, 10.12×5.06mm, Bluish Green) vs 1.8ct Topaz (Emerald, 8.1×6mm, Blue)
Quick summary: When looked from above (face-up position), 1.8ct Topaz (8.1×6mm, emerald cut) appears 24% larger than 1ct Alexandrite (10.12×5.06mm, marquise cut). See below how they compare side-by-side on a ring and finger.
| 1ct Alexandrite (marquise cut) |
vs
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1.8ct Topaz (emerald cut) |
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bluish green |
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| 10.12×5.06 mm | 8.1×6 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
1ct Alexandrite Marquise (10.12×5.06mm, Bluish Green)
and
1.8ct Topaz Emerald (8.1×6mm, 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, Alexandrite will face-up smaller than Topaz for a given
carat weight, because it has higher specific gravity
(3.73 vs. 3.53 - this means it's "heavier" compared to Topaz 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.
| 1 Ct Alexandrite (Marquise) | 1.8 Ct Topaz (Emerald) | |
| 10.12×5.06 mm | vs | 8.1×6 mm |
| 36.36 mm² | 45.2 mm² |
| 1ct Alexandrite Marquise (10.12×5.06mm) | |
| 1.8ct Topaz Emerald (8.1×6mm) | |
| Difference: 24% (8.84 mm²) |
1.8ct Topaz (Emerald, 8.1×6mm) has approx. 24% more face-up area than 1ct Alexandrite (Marquise, 10.12×5.06mm).
Popular comparisons:
- 1ct Alexandrite (Marquise, Bluish Green, 10.12 x 5.06) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Alexandrite (Marquise, Bluish Green, 10.12 x 5.06) vs. 1ct Tourmaline (Oval, Violet, 8.24 x 5.49)
- 1ct Alexandrite (Marquise, Bluish Green, 10.12 x 5.06) vs. 1.8ct Emerald (Emerald, Green, 8.86 x 6.56)
- 1ct Alexandrite (Marquise, Bluish Green, 10.12 x 5.06) vs. 1ct Emerald (Emerald, Yellowish Green, 7.28 x 5.39)
- 1ct Alexandrite (Marquise, Bluish Green, 10.12 x 5.06) vs. 1ct Alexandrite (Emerald, Bluish Green, 6.55 x 4.85)
- 1ct Alexandrite (Marquise, Bluish Green, 10.12 x 5.06) vs. 1.8ct Emerald (Emerald, Green, 8 x 6)
- 1ct Alexandrite (Marquise, Bluish Green, 10.12 x 5.06) vs. 0.5ct Emerald (Marquise, Green, 8.94 x 4.47)
- 1ct Alexandrite (Marquise, Bluish Green, 10.12 x 5.06) vs. 40ct Emerald (Emerald, Green, 24.89 x 18.44)