1ct Amethyst (Oval, 8.67×5.78mm, Violet) vs 0.25ct Diamond (Round, 4.09×4.09mm, White)
Quick summary: When looked from above (face-up position), 1ct Amethyst (8.67×5.78mm, oval cut) appears 3.1 times larger than 0.25ct Diamond (4.09×4.09mm, round cut). See below how they compare side-by-side on a ring and finger.
| 1ct Amethyst (oval cut) |
vs
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0.25ct Diamond (round cut) |
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violet |
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| 8.67×5.78 mm | 4.09×4.09 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
1ct Amethyst Oval (8.67×5.78mm, Violet)
and
0.25ct Diamond Round (4.09×4.09mm, 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.
| 1 Ct Amethyst (Oval) | 0.25 Ct Diamond (Round) | |
| 8.67×5.78 mm | vs | 4.09×4.09 mm |
| 41.09 mm² | 13.14 mm² |
| 1ct Amethyst Oval (8.67×5.78mm) | |
| 0.25ct Diamond Round (4.09×4.09mm) | |
| Difference: 213% (27.95 mm²) |
1ct Amethyst (Oval, 8.67×5.78mm) has approx. 213% more face-up area than 0.25ct Diamond (Round, 4.09×4.09mm). In other words, it's 3.13x larger.
Popular comparisons:
- 1ct Amethyst (Oval, Violet, 8.67 x 5.78) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Amethyst (Oval, Violet, 8.67 x 5.78) vs. 1ct Diamond (Oval, White, 8.12 x 5.41)
- 1ct Amethyst (Oval, Violet, 8.67 x 5.78) vs. 1ct Tanzanite (Oval, Blue, 8.07 x 5.38)
- 1ct Amethyst (Oval, Violet, 8.67 x 5.78) vs. 1ct Emerald (Oval, Green, 8.63 x 5.75)
- 1ct Amethyst (Oval, Violet, 8.67 x 5.78) vs. 1ct Sapphire (Oval, Blue, 7.56 x 5.04)
- 1ct Amethyst (Oval, Violet, 8.67 x 5.78) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1ct Amethyst (Oval, Violet, 8.67 x 5.78) vs. 8ct Alexandrite (Oval, Light Green , 15.53 x 10.35)
- 1ct Amethyst (Oval, Violet, 8.67 x 5.78) vs. 1ct Tourmaline (Oval, Violet, 8 x 6)