3ct Amethyst (Round, 9.89×9.89mm, Violet) vs 1ct Diamond (Round, 6.5×6.5mm, White)
Quick summary: When looked from above (face-up position), 3ct Amethyst (9.89×9.89mm, round cut) appears 2.3 times larger than 1ct Diamond (6.5×6.5mm, round cut). See below how they compare side-by-side on a ring and finger.
| 3ct Amethyst (round cut) |
vs
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1ct Diamond (round cut) |
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violet |
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| 9.89×9.89 mm | 6.5×6.5 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
3ct Amethyst Round (9.89×9.89mm, Violet)
and
1ct Diamond Round (6.5×6.5mm, White)
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, Diamond will face-up smaller than Amethyst for a given
carat weight, because it has higher specific gravity
(3.52 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.
| 3 Ct Amethyst (Round) | 1 Ct Diamond (Round) | |
| 9.89×9.89 mm | vs | 6.5×6.5 mm |
| 76.82 mm² | 33.18 mm² |
| 3ct Amethyst Round (9.89×9.89mm) | |
| 1ct Diamond Round (6.5×6.5mm) | |
| Difference: 132% (43.64 mm²) |
3ct Amethyst (Round, 9.89×9.89mm) has approx. 132% more face-up area than 1ct Diamond (Round, 6.5×6.5mm). In other words, it's 2.32x larger.
Popular comparisons:
- 3ct Amethyst (Round, Violet, 9.89 x 9.89) vs. 3ct Diamond (Round, White, 9.37 x 9.37)
- 3ct Amethyst (Round, Violet, 9.89 x 9.89) vs. 3ct Amethyst (Oval, Violet, 12.51 x 8.34)
- 3ct Amethyst (Round, Violet, 9.89 x 9.89) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 3ct Amethyst (Round, Violet, 9.89 x 9.89) vs. 2ct Aquamarine (Round, Light Blue, 8.59 x 8.59)
- 3ct Amethyst (Round, Violet, 9.89 x 9.89) vs. 16ct Diamond (Round, White, 16.38 x 16.38)
- 3ct Amethyst (Round, Violet, 9.89 x 9.89) vs. 2ct Amethyst (Oval, Violet, 10.94 x 7.29)
- 3ct Amethyst (Round, Violet, 9.89 x 9.89) vs. 2ct Peridot (Oval, Yellowish Green, 10.11 x 6.74)
- 3ct Amethyst (Round, Violet, 9.89 x 9.89) vs. 3ct Peridot (Oval, Yellowish Green, 11.58 x 7.72)