18ct Tanzanite (Cabochon, 19.02×12.68mm, Blue) vs 18ct Aquamarine (Cabochon, 20.4×13.6mm, Light Blue)
Quick summary: When looked from above (face-up position), 18ct Aquamarine (20.4×13.6mm, cabochon cut) appears 15% larger than 18ct Tanzanite (19.02×12.68mm, cabochon cut). See below how they compare side-by-side on a ring and finger.
| 18ct Tanzanite (cabochon cut) |
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18ct Aquamarine (cabochon cut) |
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blue |
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| 19.02×12.68 mm | 20.4×13.6 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
18ct Tanzanite Cabochon (19.02×12.68mm, Blue)
and
18ct Aquamarine Cabochon (20.4×13.6mm, Light 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 Aquamarine for a given
carat weight, because it has higher specific gravity
(3.35 vs. 2.72 - this means it's "heavier" compared to Aquamarine 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.
| 18 Ct Tanzanite (Cabochon) | 18 Ct Aquamarine (Cabochon) | |
| 19.02×12.68 mm | vs | 20.4×13.6 mm |
| 197.76 mm² | 227.5 mm² |
| 18ct Tanzanite Cabochon (19.02×12.68mm) | |
| 18ct Aquamarine Cabochon (20.4×13.6mm) | |
| Difference: 15% (29.74 mm²) |
18ct Aquamarine (Cabochon, 20.4×13.6mm) has approx. 15% more face-up area than 18ct Tanzanite (Cabochon, 19.02×12.68mm).
Popular comparisons:
- 1ct Tanzanite (Cabochon, Blue, 7.29 x 4.86) vs. 1ct Morganite (Cabochon, Light Purple, 7.8 x 5.2)
- 8.5ct Tanzanite (Cabochon, Blue, 14.9 x 9.93) vs. 1ct Diamond (Cushion, White, 5.83 x 5.83)
- 0.2ct Tanzanite (Cabochon, Light Blue, 4.26 x 2.84) vs. 1ct Diamond (Oval, Blue, 8.12 x 5.41)
- 2ct Tanzanite (Cabochon, Blue, 9.2 x 6.13) vs. 1.21ct Emerald (Emerald, Green, 7.76 x 5.75)
- 1.55ct Tanzanite (Cabochon, Blue, 8.45 x 5.63) vs. 1ct Emerald (Trillion, Green, 8.01 x 8.01)
- 1ct Tanzanite (Cabochon, Blue, 7.29 x 4.86) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 2.23ct Tanzanite (Cabochon, Blue, 9.54 x 6.36) vs. 2.23ct Diamond (Cabochon, White, 9.33 x 6.22)
- 1ct Tanzanite (Cabochon, Blue, 7.29 x 4.86) vs. 1ct Diamond (Cabochon, White, 7.14 x 4.76)
- 1ct Tanzanite (Cabochon, Blue, 7.29 x 4.86) vs. 1ct Emerald (Oval, Dark Bluish Green, 8.63 x 5.75)