12ct Amethyst (Cabochon, 17.97×11.98mm, Violet) vs 12ct Alexandrite (Cabochon, 16.04×10.69mm, Bluish Green)
Quick summary: When looked from above (face-up position), 12ct Amethyst (17.97×11.98mm, cabochon cut) appears 26% larger than 12ct Alexandrite (16.04×10.69mm, cabochon cut). See below how they compare side-by-side on a ring and finger.
| 12ct Amethyst (cabochon cut) |
vs
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12ct Alexandrite (cabochon cut) |
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violet |
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| 17.97×11.98 mm | 16.04×10.69 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
12ct Amethyst Cabochon (17.97×11.98mm, Violet)
and
12ct Alexandrite Cabochon (16.04×10.69mm, 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.
| 12 Ct Amethyst (Cabochon) | 12 Ct Alexandrite (Cabochon) | |
| 17.97×11.98 mm | vs | 16.04×10.69 mm |
| 176.53 mm² | 140.6 mm² |
| 12ct Amethyst Cabochon (17.97×11.98mm) | |
| 12ct Alexandrite Cabochon (16.04×10.69mm) | |
| Difference: 26% (35.93 mm²) |
12ct Amethyst (Cabochon, 17.97×11.98mm) has approx. 26% more face-up area than 12ct Alexandrite (Cabochon, 16.04×10.69mm).
Popular comparisons:
- 10ct Amethyst (Cabochon, Dark Violet, 16.92 x 11.28) vs. 10ct Amethyst (Princess, Violet, 13.28 x 13.28)
- 10ct Amethyst (Cabochon, Violet, 16.92 x 11.28) vs. 10ct Ruby (Baguette, Red, 14.93 x 9.95)
- 10ct Amethyst (Cabochon, Dark Violet, 16.92 x 11.28) vs. 5ct Emerald (Emerald, Green, 12.45 x 9.22)
- 7ct Amethyst (Cabochon, Violet, 15.02 x 10.01) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 10ct Amethyst (Cabochon, Dark Violet, 16.92 x 11.28) vs. 10ct Amethyst (Pear, Violet, 20.52 x 12.36)
- 8ct Amethyst (Cabochon, Dark Violet, 16 x 12) vs. 4ct Quartz (Cabochon, Light Bluish Green, 12.47 x 8.31)
- 1.28ct Amethyst (Cabochon, Violet, 8.52 x 5.68) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 4ct Amethyst (Cabochon, Violet, 12.47 x 8.31) vs. 0.35ct Sapphire (Round, Blue, 4.21 x 4.21)
- 3.5ct Amethyst (Cabochon, Violet, 11.93 x 7.95) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)