40ct Amethyst (Emerald, 25.06×19.56mm, Violet) vs 1.55ct Diamond (Round, 7.52×7.52mm, White)
Quick summary: When looked from above (face-up position), 40ct Amethyst (25.06×19.56mm, emerald cut) appears 10.3 times larger than 1.55ct Diamond (7.52×7.52mm, round cut). See below how they compare side-by-side on a ring and finger.
| 40ct Amethyst (emerald cut) |
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1.55ct Diamond (round cut) |
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| 25.06×19.56 mm | 7.52×7.52 mm | |
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Actual sizes of
40ct Amethyst Emerald (25.06×19.56mm, Violet)
and
1.55ct Diamond Round (7.52×7.52mm, 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.
| 40 Ct Amethyst (Emerald) | 1.55 Ct Diamond (Round) | |
| 25.06×19.56 mm | vs | 7.52×7.52 mm |
| 455.86 mm² | 44.41 mm² |
| 40ct Amethyst Emerald (25.06×19.56mm) | |
| 1.55ct Diamond Round (7.52×7.52mm) | |
| Difference: 926% (411.45 mm²) |
40ct Amethyst Emerald (25.06×19.56mm) has approx. 926% more face-up area than 1.55ct Diamond Round (7.52×7.52mm). In other words, it's 10.26x larger.
Popular comparisons:
- 15ct Amethyst (Emerald, Violet, 18.06 x 13.38) vs. 20ct Citrine (Cushion, Yellow, 17.41 x 17.41)
- 40ct Amethyst (Emerald, Violet, 25.06 x 18.56) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 2ct Amethyst (Emerald, Violet, 9.23 x 6.84) vs. 2ct Diamond (Emerald, White, 8.42 x 6.24)
- 23ct Amethyst (Emerald, Light Purple, 20.08 x 16.15) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 9.5ct Amethyst (Emerald, Violet, 15.51 x 11.49) vs. 4ct Diamond (Cushion, White, 9.25 x 9.25)
- 15ct Amethyst (Emerald, Violet, 18.06 x 13.38) vs. 20ct Citrine (Cushion, Light Yellow, 17.41 x 17.41)
- 1.5ct Amethyst (Emerald, Dark Violet, 8 x 6) vs. 2.62ct Sapphire (Cushion, Dark Yellowish Green, 9.08 x 7.09)
- 2ct Amethyst (Emerald, Violet, 9.23 x 6.84) vs. 2ct Amethyst (Oval, Violet, 10.94 x 7.29)
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Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.