18 Carat Aquamarine (Trillion, 21.79×21.79mm, Light Blue)
Color:
Actual size is set for screen
How big is an 18 carat trillion-cut Aquamarine?
It depends on the cut parameters and length-to-width ratio, but a typical size of an 18ct trillion-cut Aquamarine would be around 21.79×21.79 mm (±6%). Check how big it looks on a ring and finger.
Ring:
Skin tone:
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Ring width:
3.0 mm
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Saved...
64 mm
| Your settings | |
|---|---|
Ring |
Gold |
Skin tone |
Light |
Ring diameter |
16.9 mm |
Ring width |
3.0 mm |
Finger length |
64 mm |
Finger coverage |
129 % |
|
Saved...
|
|
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Ring diameter:
16.9 mm
|
Additional Info
Aquamarine is a blue to blue-green variety of beryl. The name comes from Latin "aqua marina" and means "water of the sea". The most valuable stones are those with the richest color saturation.
Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile
Gem Details
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Name:
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Aquamarine |
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Mineral Group:
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Beryl |
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Shape:
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Trillion |
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Chemical Formula:
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Be3Al2Si6O18 |
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Crystal Structure:
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Hexagonal |
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Hardness:
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7.5 - 8.0 |
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Specific Gravity
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2.72 |
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Carat weight:
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18 ct |
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Gram weight:
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3.6 g (0.127 ounces) |
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Points:
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1800 pts |
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Length:
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21.79 mm |
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Width:
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21.79 mm |
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Est. face-up size:
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294.38 mm² |
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Volume:
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1323.53 mm³ |
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Length-to-width ratio:
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1 |
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Refractive Index:
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1.57 - 1.58 |
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Luster:
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Vitreous |
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Wearability:
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Excellent |
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Care Instructions:
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No special care |
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Color:
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Aquamarine can be found in the following colors:
    
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Birthstone:
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Aquamarine is a birthstone for the month of March |
Popular comparisons:
- 4ct Aquamarine (Trillion, Light Blue, 12.72 x 12.72) vs. 1.35ct Aquamarine (Trillion, Light Blue, 8.86 x 8.86)
- 1.3ct Aquamarine (Trillion, Light Blue, 8 x 8) vs. 1.5ct Aquamarine (Round, Light Blue, 7.8 x 7.8)
- 7ct Aquamarine (Trillion, Light Blue, 15.33 x 15.33) vs. 7ct Diamond (Round, White, 12.43 x 12.43)
- 7ct Aquamarine (Trillion, Light Blue, 14 x 14) vs. 7ct Diamond (Round, White, 12.43 x 12.43)
- 1.3ct Aquamarine (Trillion, Light Blue, 8.74 x 8.74) vs. 1.5ct Aquamarine (Round, Light Blue, 7.8 x 7.8)
- 1ct Aquamarine (Trillion, Bluish Green, 8.01 x 8.01) vs. 1ct Diamond (Baguette, White, 7.23 x 4.82)
- 5ct Aquamarine (Trillion, Light Blue, 13.7 x 13.7) vs. 5ct Topaz (Trillion, Blue, 12.53 x 12.53)
- 1ct Aquamarine (Trillion, Light Blue, 8.01 x 8.01) vs. 1ct Diamond (Trillion, White, 7.74 x 7.74)