8.5ct Amethyst (Oval, 17.96×11.97mm, Violet) vs 8.5ct Tanzanite (Oval, 16.61×11.07mm, Blue)
Quick summary: When looked from above (face-up position), 8.5ct Amethyst (17.96×11.97mm, oval cut) appears 17% larger than 8.5ct Tanzanite (16.61×11.07mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 8.5ct Amethyst (oval cut) |
vs
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8.5ct Tanzanite (oval cut) |
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violet |
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| 17.96×11.97 mm | 16.61×11.07 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
8.5ct Amethyst Oval (17.96×11.97mm, Violet)
and
8.5ct Tanzanite Oval (16.61×11.07mm, 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, Tanzanite will face-up smaller than Amethyst for a given
carat weight, because it has higher specific gravity
(3.35 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.
| 8.5 Ct Amethyst (Oval) | 8.5 Ct Tanzanite (Oval) | |
| 17.96×11.97 mm | vs | 16.61×11.07 mm |
| 176.28 mm² | 150.78 mm² |
| 8.5ct Amethyst Oval (17.96×11.97mm) | |
| 8.5ct Tanzanite Oval (16.61×11.07mm) | |
| Difference: 17% (25.5 mm²) |
8.5ct Amethyst (Oval, 17.96×11.97mm) has approx. 17% more face-up area than 8.5ct Tanzanite (Oval, 16.61×11.07mm).
Popular comparisons:
- 2.5ct Amethyst (Oval, Violet, 11.78 x 7.85) vs. 2.5ct Amethyst (Round, Violet, 9.31 x 9.31)
- 0.2ct Amethyst (Oval, Purple, 5.07 x 3.38) vs. 0.3ct Amethyst (Oval, Purple, 5.81 x 3.87)
- 1ct Amethyst (Oval, Violet, 9 x 7) vs. 1ct Tourmaline (Oval, Violet, 8 x 6)
- 9.5ct Amethyst (Oval, Violet, 17 x 13) vs. 4ct Diamond (Cushion, White, 9.25 x 9.25)
- 6ct Amethyst (Oval, Violet, 15.77 x 10.51) vs. 7.5ct Ruby (Oval, Red, 14.81 x 9.87)
- 6ct Amethyst (Oval, Violet, 15.77 x 10.51) vs. 2ct Diamond (Oval, White, 10.23 x 6.82)
- 5ct Amethyst (Oval, Violet, 14.84 x 9.89) vs. 5ct Quartz (Pear, Dark Red, 16.28 x 9.81)
- 1ct Amethyst (Oval, Violet, 8.67 x 5.78) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 6ct Amethyst (Oval, Violet, 15.77 x 10.51) vs. 6ct Emerald (Oval, Green, 15.68 x 10.45)