17ct Amethyst (Heart, 18.46×18.46mm, Violet) vs 17ct Alexandrite (Heart, 16.47×16.47mm, Bluish Green)
Quick summary: When looked from above (face-up position), 17ct Amethyst (18.46×18.46mm, heart cut) appears 26% larger than 17ct Alexandrite (16.47×16.47mm, heart cut). See below how they compare side-by-side on a ring and finger.
| 17ct Amethyst (heart cut) |
vs
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17ct Alexandrite (heart cut) |
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violet |
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| 18.46×18.46 mm | 16.47×16.47 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
17ct Amethyst Heart (18.46×18.46mm, Violet)
and
17ct Alexandrite Heart (16.47×16.47mm, Bluish 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 Amethyst for a given
carat weight, because it has higher specific gravity
(3.73 vs. 2.65 - this means it's "heavier" compared to Amethyst 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.
| 17 Ct Amethyst (Heart) | 17 Ct Alexandrite (Heart) | |
| 18.46×18.46 mm | vs | 16.47×16.47 mm |
| 245.36 mm² | 195.31 mm² |
| 17ct Amethyst Heart (18.46×18.46mm) | |
| 17ct Alexandrite Heart (16.47×16.47mm) | |
| Difference: 26% (50.05 mm²) |
17ct Amethyst (Heart, 18.46×18.46mm) has approx. 26% more face-up area than 17ct Alexandrite (Heart, 16.47×16.47mm).
Popular comparisons:
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- 1ct Sapphire (Baguette, Blue, 6.93 x 4.62) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Topaz (Round, Blue, 6 x 6) vs. 0.5ct Topaz (Round, Blue, 5 x 5)