4ct Amethyst (Cabochon, 12.47×8.31mm, Violet) vs 0.35ct Sapphire (Round, 4.21×4.21mm, Blue)
Quick summary: When looked from above (face-up position), 4ct Amethyst (12.47×8.31mm, cabochon cut) appears 6.1 times larger than 0.35ct Sapphire (4.21×4.21mm, round cut). See below how they compare side-by-side on a ring and finger.
| 4ct Amethyst (cabochon cut) |
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0.35ct Sapphire (round cut) |
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violet |
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| 12.47×8.31 mm | 4.21×4.21 mm | |
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Actual sizes of
4ct Amethyst Cabochon (12.47×8.31mm, Violet)
and
0.35ct Sapphire Round (4.21×4.21mm, Blue)
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, Sapphire will face-up smaller than Amethyst for a given
carat weight, because it has higher specific gravity
(4 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.
| 4 Ct Amethyst (Cabochon) | 0.35 Ct Sapphire (Round) | |
| 12.47×8.31 mm | vs | 4.21×4.21 mm |
| 84.97 mm² | 13.92 mm² |
| 4ct Amethyst Cabochon (12.47×8.31mm) | |
| 0.35ct Sapphire Round (4.21×4.21mm) | |
| Difference: 510% (71.05 mm²) |
4ct Amethyst Cabochon (12.47×8.31mm) has approx. 510% more face-up area than 0.35ct Sapphire Round (4.21×4.21mm). In other words, it's 6.1x larger.
Popular comparisons:
- 4ct Amethyst (Cabochon, Violet, 12.47 x 8.31) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 4ct Amethyst (Cabochon, Violet, 12.47 x 8.31) vs. 2.26ct Diamond (Oval, White, 10.65 x 7.1)
- 10ct Amethyst (Cabochon, Dark Violet, 16.92 x 11.28) vs. 10ct Amethyst (Princess, Violet, 13.28 x 13.28)
- 10ct Amethyst (Cabochon, Violet, 16.92 x 11.28) vs. 10ct Ruby (Baguette, Red, 14.93 x 9.95)
- 10ct Amethyst (Cabochon, Dark Violet, 16.92 x 11.28) vs. 5ct Emerald (Emerald, Green, 12.45 x 9.22)
- 7ct Amethyst (Cabochon, Violet, 15.02 x 10.01) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 10ct Amethyst (Cabochon, Dark Violet, 16.92 x 11.28) vs. 10ct Amethyst (Pear, Violet, 20.52 x 12.36)
- 8ct Amethyst (Cabochon, Dark Violet, 16 x 12) vs. 4ct Quartz (Cabochon, Light Bluish Green, 12.47 x 8.31)
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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.