0.8ct Tourmaline (Oval, 7.65×5.1mm, Violet) vs 7.4ct Amethyst (Oval, 16.91×11.27mm, Violet)
Quick summary: When looked from above (face-up position), 7.4ct Amethyst (16.91×11.27mm, oval cut) appears 4.9 times larger than 0.8ct Tourmaline (7.65×5.1mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 0.8ct Tourmaline (oval cut) |
vs
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7.4ct Amethyst (oval cut) |
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violet |
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| 7.65×5.1 mm | 16.91×11.27 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
0.8ct Tourmaline Oval (7.65×5.1mm, Violet)
and
7.4ct Amethyst Oval (16.91×11.27mm, 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, Tourmaline will face-up smaller than Amethyst for a given
carat weight, because it has higher specific gravity
(3.06 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.
| 0.8 Ct Tourmaline (Oval) | 7.4 Ct Amethyst (Oval) | |
| 7.65×5.1 mm | vs | 16.91×11.27 mm |
| 31.99 mm² | 156.27 mm² |
| 0.8ct Tourmaline Oval (7.65×5.1mm) | |
| 7.4ct Amethyst Oval (16.91×11.27mm) | |
| Difference: 388% (124.28 mm²) |
7.4ct Amethyst (Oval, 16.91×11.27mm) has approx. 388% more face-up area than 0.8ct Tourmaline (Oval, 7.65×5.1mm). In other words, it's 4.88x larger.
Popular comparisons:
- 0.8ct Tourmaline (Oval, Violet, 7.65 x 5.1) vs. 0.58ct Emerald (Oval, Green, 7.19 x 4.79)
- 0.8ct Tourmaline (Oval, Violet, 7.65 x 5.1) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 5.8ct Tourmaline (Oval, Violet, 14.79 x 9.86) vs. 8ct Sapphire (Oval, Blue, 15.12 x 10.08)
- 14ct Tourmaline (Oval, Light Purple, 19.85 x 14) vs. 14ct Kunzite (Oval, Light Purple, 19.68 x 14)
- 3ct Tourmaline (Oval, White, 11.88 x 7.92) vs. 4.5ct Diamond (Oval, White, 13.4 x 8.93)
- 2.84ct Tourmaline (Oval, Violet, 11.66 x 7.77) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Tourmaline (Oval, Red, 8.24 x 5.49) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 8.8ct Tourmaline (Oval, Dark Yellowish Green, 15.22 x 11.45) vs. 6.54ct Sapphire (Pear, Dark Green, 12.83 x 9.31)