30ct Amethyst (Cushion, 19.73×19.73mm, Violet) vs 30ct Alexandrite (Cushion, 17.61×17.61mm, Bluish Green)
Quick summary: When looked from above (face-up position), 30ct Amethyst (19.73×19.73mm, cushion cut) appears 26% larger than 30ct Alexandrite (17.61×17.61mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 30ct Amethyst (cushion cut) |
vs
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30ct Alexandrite (cushion cut) |
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violet |
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| 19.73×19.73 mm | 17.61×17.61 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
30ct Amethyst Cushion (19.73×19.73mm, Violet)
and
30ct Alexandrite Cushion (17.61×17.61mm, 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.
| 30 Ct Amethyst (Cushion) | 30 Ct Alexandrite (Cushion) | |
| 19.73×19.73 mm | vs | 17.61×17.61 mm |
| 350.35 mm² | 279.1 mm² |
| 30ct Amethyst Cushion (19.73×19.73mm) | |
| 30ct Alexandrite Cushion (17.61×17.61mm) | |
| Difference: 26% (71.25 mm²) |
30ct Amethyst (Cushion, 19.73×19.73mm) has approx. 26% more face-up area than 30ct Alexandrite (Cushion, 17.61×17.61mm).
Popular comparisons:
- 2ct Amethyst (Cushion, Violet, 8 x 8) vs. 2ct Diamond (Cushion, White, 7.34 x 7.34)
- 1ct Amethyst (Cushion, Purple, 6.41 x 6.41) vs. 1ct Quartz (Round, Yellowish Green, 6.86 x 6.86)
- 2.11ct Amethyst (Cushion, Violet, 8.23 x 8.23) vs. 2.11ct Diamond (Cushion, White, 7.47 x 7.47)
- 1.35ct Amethyst (Cushion, Violet, 7.09 x 7.09) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 3ct Amethyst (Cushion, Violet, 9.25 x 9.25) vs. 3ct Diamond (Cushion, White, 8.4 x 8.4)
- 35ct Amethyst (Cushion, Violet, 20.98 x 20.98) vs. 1ct Ruby (Round, Red, 5.98 x 5.98)
- 26ct Amethyst (Cushion, Violet, 19 x 19) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Amethyst (Cushion, Violet, 6.41 x 6.41) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1ct Amethyst (Cushion, Violet, 6.41 x 6.41) vs. 1ct Diamond (Cushion, White, 5.83 x 5.83)