20ct Amethyst (Round, 18.62×18.62mm, Violet) vs 30ct Emerald (Emerald, 22.61×16.75mm, Green)
Quick summary: When looked from above (face-up position), 30ct Emerald (22.61×16.75mm, emerald cut) appears 29% larger than 20ct Amethyst (18.62×18.62mm, round cut). See below how they compare side-by-side on a ring and finger.
| 20ct Amethyst (round cut) |
vs
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30ct Emerald (emerald cut) |
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violet |
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| 18.62×18.62 mm | 22.61×16.75 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
20ct Amethyst Round (18.62×18.62mm, Violet)
and
30ct Emerald Emerald (22.61×16.75mm, 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, Emerald will face-up slightly smaller than Amethyst for a given
carat weight, because it has higher specific gravity
(2.72 vs. 2.65 - this means it's "slightly 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.
| 20 Ct Amethyst (Round) | 30 Ct Emerald (Emerald) | |
| 18.62×18.62 mm | vs | 22.61×16.75 mm |
| 272.3 mm² | 352.21 mm² |
| 20ct Amethyst Round (18.62×18.62mm) | |
| 30ct Emerald Emerald (22.61×16.75mm) | |
| Difference: 29% (79.91 mm²) |
30ct Emerald (Emerald, 22.61×16.75mm) has approx. 29% more face-up area than 20ct Amethyst (Round, 18.62×18.62mm).
Popular comparisons:
- 20ct Amethyst (Round, Violet, 18.62 x 18.62) vs. 8.3ct Emerald (Emerald, Green, 14.74 x 10.92)
- 20ct Amethyst (Round, Violet, 18.62 x 18.62) vs. 4ct Emerald (Emerald, Green, 11.56 x 8.56)
- 20ct Amethyst (Round, Violet, 18.62 x 18.62) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 20ct Amethyst (Round, Violet, 18.62 x 18.62) vs. 8ct Emerald (Emerald, Green, 14.55 x 10.78)
- 20ct Amethyst (Round, Violet, 18.62 x 18.62) vs. 1.01ct Emerald (Emerald, Green, 7.3 x 5.41)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Tanzanite (Emerald, Blue, 6.8 x 5.04)
- 2ct Amethyst (Round, Violet, 8.64 x 8.64) vs. 2ct Amethyst (Oval, Violet, 10.94 x 7.29)