0.42ct Diamond (Princess, 4.13×4.13mm, White) vs 8.5ct Amethyst (Cabochon, 16.02×10.68mm, Violet)
Quick summary: When looked from above (face-up position), 8.5ct Amethyst (16.02×10.68mm, cabochon cut) appears 8.2 times larger than 0.42ct Diamond (4.13×4.13mm, princess cut). See below how they compare side-by-side on a ring and finger.
| 0.42ct Diamond (princess cut) |
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8.5ct Amethyst (cabochon cut) |
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white |
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| 4.13×4.13 mm | 16.02×10.68 mm | |
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Actual sizes of
0.42ct Diamond Princess (4.13×4.13mm, White)
and
8.5ct Amethyst Cabochon (16.02×10.68mm, Violet)
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.
| 0.42 Ct Diamond (Princess) | 8.5 Ct Amethyst (Cabochon) | |
| 4.13×4.13 mm | vs | 16.02×10.68 mm |
| 17.06 mm² | 140.3 mm² |
| 0.42ct Diamond Princess (4.13×4.13mm) | |
| 8.5ct Amethyst Cabochon (16.02×10.68mm) | |
| Difference: 722% (123.24 mm²) |
8.5ct Amethyst Cabochon (16.02×10.68mm) has approx. 722% more face-up area than 0.42ct Diamond Princess (4.13×4.13mm). In other words, it's 8.22x larger.
Popular comparisons:
- 0.42ct Diamond (Princess, White, 4.13 x 4.13) vs. 0.5ct Diamond (Princess, White, 4.37 x 4.37)
- 0.42ct Diamond (Princess, White, 4.13 x 4.13) vs. 1.12ct Amethyst (Princess, Violet, 6.4 x 6.4)
- 0.1ct Diamond (Princess, White, 2.56 x 2.56) vs. 0.15ct Diamond (Round, White, 3.45 x 3.45)
- 1.5ct Diamond (Princess, White, 6.31 x 6.31) vs. 1.5ct Diamond (Round, White, 7.44 x 7.44)
- 0.2ct Diamond (Princess, White, 3.22 x 3.22) vs. 0.3ct Diamond (Princess, White, 3.69 x 3.69)
- 0.15ct Diamond (Princess, White, 2.93 x 2.93) vs. 0.4ct Diamond (Princess, White, 4.06 x 4.06)
- 0.7ct Diamond (Princess, White, 4.83 x 4.82) vs. 0.7ct Diamond (Princess, White, 4.82 x 4.77)
- 1.53ct Diamond (Princess, White, 6.34 x 6.39) vs. 1.24ct Diamond (Emerald, White, 6.01 x 6.12)
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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.