28ct Amethyst (Princess, 18.3×18.3mm, Violet) vs 28ct Alexandrite (Princess, 16.33×16.33mm, Bluish Green)
Quick summary: When looked from above (face-up position), 28ct Amethyst (18.3×18.3mm, princess cut) appears 26% larger than 28ct Alexandrite (16.33×16.33mm, princess cut). See below how they compare side-by-side on a ring and finger.
| 28ct Amethyst (princess cut) |
vs
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28ct Alexandrite (princess cut) |
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violet |
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| 18.3×18.3 mm | 16.33×16.33 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
28ct Amethyst Princess (18.3×18.3mm, Violet)
and
28ct Alexandrite Princess (16.33×16.33mm, 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.
| 28 Ct Amethyst (Princess) | 28 Ct Alexandrite (Princess) | |
| 18.3×18.3 mm | vs | 16.33×16.33 mm |
| 334.89 mm² | 266.67 mm² |
| 28ct Amethyst Princess (18.3×18.3mm) | |
| 28ct Alexandrite Princess (16.33×16.33mm) | |
| Difference: 26% (68.22 mm²) |
28ct Amethyst (Princess, 18.3×18.3mm) has approx. 26% more face-up area than 28ct Alexandrite (Princess, 16.33×16.33mm).
Popular comparisons:
- 1ct Amethyst (Princess, Violet, 6.17 x 6.17) vs. 1ct Diamond (Princess, White, 5.51 x 5.51)
- 2ct Amethyst (Princess, Violet, 7.77 x 7.77) vs. 2ct Amethyst (Oval, Violet, 10.94 x 7.29)
- 1ct Amethyst (Princess, Dark Purple, 6.17 x 6.17) vs. 1ct Tanzanite (Princess, Dark Blue, 5.73 x 5.73)
- 3.72ct Amethyst (Princess, Violet, 9.55 x 9.55) vs. 3.72ct Diamond (Princess, White, 8.54 x 8.54)
- 1ct Amethyst (Princess, Violet, 6.17 x 6.17) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Amethyst (Princess, Dark Violet, 6.17 x 6.17) vs. 1ct Tanzanite (Princess, Dark Blue, 5.73 x 5.73)
- 0.05ct Amethyst (Princess, Violet, 2.27 x 2.27) vs. 0.05ct Aquamarine (Princess, Light Blue, 2.26 x 2.26)
- 5ct Amethyst (Princess, Dark Violet, 10.54 x 10.54) vs. 5ct Sapphire (Emerald, Blue, 10.92 x 8.09)
- 10ct Amethyst (Princess, Violet, 13.28 x 13.28) vs. 10ct Amethyst (Oval, Dark Violet, 18.69 x 12.46)