0.75ct Amethyst (Cabochon, 7.13×4.75mm, Violet) vs 0.28ct Sapphire (Round, 3.91×3.91mm, Blue)
Quick summary: When looked from above (face-up position), 0.75ct Amethyst (7.13×4.75mm, cabochon cut) appears 2.3 times larger than 0.28ct Sapphire (3.91×3.91mm, round cut). See below how they compare side-by-side on a ring and finger.
| 0.75ct Amethyst (cabochon cut) |
vs
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0.28ct Sapphire (round cut) |
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violet |
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| 7.13×4.75 mm | 3.91×3.91 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
0.75ct Amethyst Cabochon (7.13×4.75mm, Violet)
and
0.28ct Sapphire Round (3.91×3.91mm, 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.
| 0.75 Ct Amethyst (Cabochon) | 0.28 Ct Sapphire (Round) | |
| 7.13×4.75 mm | vs | 3.91×3.91 mm |
| 27.77 mm² | 12.01 mm² |
| 0.75ct Amethyst Cabochon (7.13×4.75mm) | |
| 0.28ct Sapphire Round (3.91×3.91mm) | |
| Difference: 131% (15.76 mm²) |
0.75ct Amethyst (Cabochon, 7.13×4.75mm) has approx. 131% more face-up area than 0.28ct Sapphire (Round, 3.91×3.91mm). In other words, it's 2.31x larger.
Popular comparisons:
- 0.75ct Amethyst (Cabochon, Violet, 7.13 x 4.75) vs. 1.43ct Sapphire (Cabochon, Blue, 7.71 x 6.65)
- 0.75ct Amethyst (Cabochon, Violet, 7.13 x 4.75) vs. 0.6ct Sapphire (Cabochon, Blue, 5.78 x 3.85)
- 0.75ct Amethyst (Cabochon, Violet, 7.13 x 4.75) vs. 1.75ct Zircon (Round, Orange, 6.85 x 6.85)
- 0.75ct Amethyst (Cabochon, Violet, 7.13 x 4.75) vs. 0.6ct Citrine (Trillion, Light Orange, 6.8 x 6.8)
- 0.75ct Amethyst (Cabochon, Violet, 7.13 x 4.75) vs. 6.35ct Citrine (Pear, Light Orange, 17.65 x 10.63)
- 0.75ct Amethyst (Cabochon, Violet, 7.13 x 4.75) vs. 2.05ct Topaz (Round, Blue, 7.92 x 7.92)
- 0.75ct Amethyst (Cabochon, Violet, 7.13 x 4.75) vs. 1.25ct Sapphire (Cabochon, Blue, 7.37 x 4.91)
- 0.75ct Amethyst (Cabochon, Violet, 7.13 x 4.75) vs. 1.92ct Sapphire (Cabochon, Blue, 8.51 x 5.67)