2.5ct Amethyst (Round, 9.31×9.31mm, Violet) vs 2.5ct Diamond (Round, 8.82×8.82mm, White)
Quick summary: When looked from above (face-up position), 2.5ct Amethyst (9.31×9.31mm, round cut) appears 11% larger than 2.5ct Diamond (8.82×8.82mm, round cut). See below how they compare side-by-side on a ring and finger.
| 2.5ct Amethyst (round cut) |
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2.5ct Diamond (round cut) |
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violet |
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| 9.31×9.31 mm | 8.82×8.82 mm | |
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Actual sizes of
2.5ct Amethyst Round (9.31×9.31mm, Violet)
and
2.5ct Diamond Round (8.82×8.82mm, 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.
| 2.5 Ct Amethyst (Round) | 2.5 Ct Diamond (Round) | |
| 9.31×9.31 mm | vs | 8.82×8.82 mm |
| 68.08 mm² | 61.1 mm² |
| 2.5ct Amethyst Round (9.31×9.31mm) | |
| 2.5ct Diamond Round (8.82×8.82mm) | |
| Difference: 11% (6.98 mm²) |
2.5ct Amethyst Round (9.31×9.31mm) has approx. 11% more face-up area than 2.5ct Diamond Round (8.82×8.82mm).
Popular comparisons:
- 2.5ct Amethyst (Round, Violet, 9.31 x 9.31) vs. 2ct Diamond (Round, White, 8.19 x 8.19)
- 2.5ct Amethyst (Round, Violet, 9.31 x 9.31) vs. 1.65ct Sapphire (Emerald, Blue, 7.8 x 5.8)
- 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)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Tanzanite (Round, Blue, 6.37 x 6.37)
- 8ct Amethyst (Round, Violet, 13.72 x 13.72) vs. 8ct Emerald (Emerald, Green, 14.55 x 10.78)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
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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.