1ct Alexandrite (Cabochon, 7.02×4.68mm, Bluish Green) vs 20ct Emerald (Cabochon, 21.18×14.12mm, Green)
Quick summary: When looked from above (face-up position), 20ct Emerald (21.18×14.12mm, cabochon cut) appears 9.1 times larger than 1ct Alexandrite (7.02×4.68mm, cabochon cut). See below how they compare side-by-side on a ring and finger.
| 1ct Alexandrite (cabochon cut) |
vs
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20ct Emerald (cabochon cut) |
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bluish green |
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| 7.02×4.68 mm | 21.18×14.12 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 Cabochon (7.02×4.68mm, Bluish Green)
and
20ct Emerald Cabochon (21.18×14.12mm, Green)
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 Emerald for a given
carat weight, because it has higher specific gravity
(3.73 vs. 2.72 - this means it's "heavier" compared to Emerald 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 (Cabochon) | 20 Ct Emerald (Cabochon) | |
| 7.02×4.68 mm | vs | 21.18×14.12 mm |
| 26.94 mm² | 245.23 mm² |
| 1ct Alexandrite Cabochon (7.02×4.68mm) | |
| 20ct Emerald Cabochon (21.18×14.12mm) | |
| Difference: 810% (218.29 mm²) |
20ct Emerald (Cabochon, 21.18×14.12mm) has approx. 810% more face-up area than 1ct Alexandrite (Cabochon, 7.02×4.68mm). In other words, it's 9.1x larger.
Popular comparisons:
- 1ct Alexandrite (Cabochon, Bluish Green, 7.02 x 4.68) vs. 1ct Emerald (Cabochon, Green, 7.8 x 5.2)
- 1ct Alexandrite (Cabochon, Bluish Green, 7.02 x 4.68) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Alexandrite (Cabochon, Bluish Green, 7.02 x 4.68) vs. 1ct Diamond (Cabochon, White, 7.14 x 4.76)
- 1ct Alexandrite (Cabochon, Bluish Green, 7.02 x 4.68) vs. 4ct Emerald (Cabochon, Green, 12.39 x 8.26)
- 1ct Alexandrite (Cabochon, Bluish Green, 7.02 x 4.68) vs. 1ct Alexandrite (Trillion, Bluish Green, 7.21 x 7.21)
- 1ct Alexandrite (Cabochon, Dark Purple, 7.02 x 4.68) vs. 1ct Alexandrite (Trillion, Bluish Green, 7.21 x 7.21)
- 12ct Alexandrite (Cabochon, Bluish Green, 16.08 x 10.72) vs. 1ct Alexandrite (Emerald, Bluish Green, 6.55 x 4.85)
- 3.24ct Alexandrite (Cabochon, Bluish Green, 10.4 x 6.93) vs. 3.24ct Tanzanite (Oval, Blue, 11.94 x 7.96)