18ct Aquamarine (Round, 17.82×17.82mm, Light Blue) vs 18ct Diamond (Round, 17.03×17.03mm, White)
Quick summary: When looked from above (face-up position), 18ct Aquamarine (17.82×17.82mm, round cut) appears 9% larger than 18ct Diamond (17.03×17.03mm, round cut). See below how they compare side-by-side on a ring and finger.
| 18ct Aquamarine (round cut) |
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18ct Diamond (round cut) |
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light blue |
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| 17.82×17.82 mm | 17.03×17.03 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 Aquamarine Round (17.82×17.82mm, Light Blue)
and
18ct Diamond Round (17.03×17.03mm, White)
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, Diamond will face-up smaller than Aquamarine for a given
carat weight, because it has higher specific gravity
(3.52 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 Aquamarine (Round) | 18 Ct Diamond (Round) | |
| 17.82×17.82 mm | vs | 17.03×17.03 mm |
| 249.41 mm² | 227.78 mm² |
| 18ct Aquamarine Round (17.82×17.82mm) | |
| 18ct Diamond Round (17.03×17.03mm) | |
| Difference: 9% (21.63 mm²) |
18ct Aquamarine (Round, 17.82×17.82mm) has approx. 9% more face-up area than 18ct Diamond (Round, 17.03×17.03mm).
Popular comparisons:
- 2ct Aquamarine (Round, Blue, 8.59 x 8.59) vs. 2ct Aquamarine (Emerald, Light Blue, 9.17 x 6.79)
- 1ct Aquamarine (Round, Light Blue, 6.82 x 6.82) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1.5ct Aquamarine (Round, Light Blue, 7.8 x 7.8) vs. 1.5ct Diamond (Round, White, 7.44 x 7.44)
- 1ct Aquamarine (Round, Light Blue, 6.82 x 6.82) vs. 2ct Aquamarine (Round, Light Blue, 8.59 x 8.59)
- 3ct Aquamarine (Round, Light Blue, 9.83 x 9.83) vs. 3ct Diamond (Round, White, 9.37 x 9.37)
- 0.06ct Aquamarine (Round, Light Blue, 2.67 x 2.67) vs. 0.06ct Diamond (Round, White, 2.54 x 2.54)
- 1ct Aquamarine (Round, Light Blue, 6.82 x 6.82) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 2ct Aquamarine (Round, Light Blue, 8.59 x 8.59) vs. 2ct Diamond (Round, White, 8.19 x 8.19)
- 1ct Aquamarine (Round, Light Blue, 6.82 x 6.82) vs. 1.5ct Aquamarine (Round, Light Blue, 7.8 x 7.8)