4ct Amethyst (Marquise, 17.7×8.85mm, Violet) vs 4ct Tanzanite (Marquise, 16.38×8.19mm, Blue)
Quick summary: When looked from above (face-up position), 4ct Amethyst (17.7×8.85mm, marquise cut) appears 17% larger than 4ct Tanzanite (16.38×8.19mm, marquise cut). See below how they compare side-by-side on a ring and finger.
| 4ct Amethyst (marquise cut) |
vs
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4ct Tanzanite (marquise cut) |
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violet |
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| 17.7×8.85 mm | 16.38×8.19 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
4ct Amethyst Marquise (17.7×8.85mm, Violet)
and
4ct Tanzanite Marquise (16.38×8.19mm, 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.
| 4 Ct Amethyst (Marquise) | 4 Ct Tanzanite (Marquise) | |
| 17.7×8.85 mm | vs | 16.38×8.19 mm |
| 111.22 mm² | 95.25 mm² |
| 4ct Amethyst Marquise (17.7×8.85mm) | |
| 4ct Tanzanite Marquise (16.38×8.19mm) | |
| Difference: 17% (15.97 mm²) |
4ct Amethyst (Marquise, 17.7×8.85mm) has approx. 17% more face-up area than 4ct Tanzanite (Marquise, 16.38×8.19mm).
Popular comparisons:
- 1ct Amethyst (Marquise, Violet, 11.32 x 5.66) vs. 1ct Tanzanite (Marquise, Blue, 10.52 x 5.26)
- 1.7ct Amethyst (Marquise, Violet, 13.52 x 6.76) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 10.55ct Amethyst (Marquise, Violet, 24.84 x 12.42) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 3ct Amethyst (Marquise, Violet, 16.32 x 8.16) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Amethyst (Marquise, Violet, 11.32 x 5.66) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 0.5ct Amethyst (Marquise, Violet, 8.98 x 4.49) vs. 0.06ct Diamond (Baguette, White, 2.84 x 1.89)
- 1ct Amethyst (Marquise, Dark Violet, 11.32 x 5.66) vs. 1ct Tanzanite (Emerald, Blue, 6.8 x 5.04)
- 1.52ct Amethyst (Marquise, Violet, 13.02 x 6.51) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 2ct Amethyst (Marquise, Violet, 14.26 x 7.13) vs. 1ct Amethyst (Marquise, Violet, 11.32 x 5.66)