1ct Amethyst (Round, 6.86×6.86mm, Violet) vs 1ct Tanzanite (Round, 6.37×6.37mm, Blue)
Quick summary: When looked from above (face-up position), 1ct Amethyst (6.86×6.86mm, round cut) appears 16% larger than 1ct Tanzanite (6.37×6.37mm, round cut). See below how they compare side-by-side on a ring and finger.
| 1ct Amethyst (round cut) |
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1ct Tanzanite (round cut) |
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violet |
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| 6.86×6.86 mm | 6.37×6.37 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
1ct Amethyst Round (6.86×6.86mm, Violet)
and
1ct Tanzanite Round (6.37×6.37mm, 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.
| 1 Ct Amethyst (Round) | 1 Ct Tanzanite (Round) | |
| 6.86×6.86 mm | vs | 6.37×6.37 mm |
| 36.96 mm² | 31.87 mm² |
| 1ct Amethyst Round (6.86×6.86mm) | |
| 1ct Tanzanite Round (6.37×6.37mm) | |
| Difference: 16% (5.09 mm²) |
1ct Amethyst (Round, 6.86×6.86mm) has approx. 16% more face-up area than 1ct Tanzanite (Round, 6.37×6.37mm).
Popular comparisons:
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Tanzanite (Emerald, Blue, 6.8 x 5.04)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Zircon (Round, Orange, 5.67 x 5.67)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Emerald (Round, Green, 6.82 x 6.82)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Diamond (Emerald, White, 6.68 x 4.95)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Tanzanite (Round, Blue, 6.86 x 6.86)
- 1ct Amethyst (Round, Violet, 6.86 x 6.86) vs. 1ct Tanzanite (Round, Dark Blue, 6.37 x 6.37)
Use the simulator on this page to play around with different ring and finger configurations.