13ct Aquamarine (Cabochon, 18.3×12.2mm, Light Blue) vs 13ct Diamond (Cabochon, 16.79×11.19mm, White)
Quick summary: When looked from above (face-up position), 13ct Aquamarine (18.3×12.2mm, cabochon cut) appears 19% larger than 13ct Diamond (16.79×11.19mm, cabochon cut). See below how they compare side-by-side on a ring and finger.
| 13ct Aquamarine (cabochon cut) |
vs
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13ct Diamond (cabochon cut) |
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light blue |
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| 18.3×12.2 mm | 16.79×11.19 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
13ct Aquamarine Cabochon (18.3×12.2mm, Light Blue)
and
13ct Diamond Cabochon (16.79×11.19mm, 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.
| 13 Ct Aquamarine (Cabochon) | 13 Ct Diamond (Cabochon) | |
| 18.3×12.2 mm | vs | 16.79×11.19 mm |
| 183.07 mm² | 154.06 mm² |
| 13ct Aquamarine Cabochon (18.3×12.2mm) | |
| 13ct Diamond Cabochon (16.79×11.19mm) | |
| Difference: 19% (29.01 mm²) |
13ct Aquamarine (Cabochon, 18.3×12.2mm) has approx. 19% more face-up area than 13ct Diamond (Cabochon, 16.79×11.19mm).
Popular comparisons:
- 1ct Aquamarine (Cabochon, Bluish Green, 7.8 x 5.2) vs. 1ct Amethyst (Baguette, Dark Violet, 7.95 x 5.3)
- 1ct Aquamarine (Cabochon, Light Blue, 7.8 x 5.2) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 3ct Aquamarine (Cabochon, Light Blue, 11.25 x 7.5) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 20ct Aquamarine (Cabochon, Light Blue, 21.18 x 14.12) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Aquamarine (Cabochon, Light Blue, 6 x 6) vs. 1ct Diamond (Round, White, 6 x 6)
- 6ct Aquamarine (Cabochon, Light Blue, 14 x 10) vs. 7ct Aquamarine (Cabochon, Light Blue, 16 x 11)
- 1.5ct Aquamarine (Cabochon, Light Blue, 8.93 x 5.95) vs. 1.5ct Diamond (Cushion, White, 6.67 x 6.67)
- 1.5ct Aquamarine (Cabochon, Light Blue, 8.93 x 5.95) vs. 1.5ct Sapphire (Cabochon, Blue, 7.83 x 5.22)
- 1ct Aquamarine (Cabochon, Light Blue, 7.79 x 5.19) vs. 1ct Diamond (Round, White, 6.5 x 6.5)