18 Carat Diamond (Marquise, 27.22×13.61mm, White)
Color:
Actual size is set for screen
How big is an 18 carat marquise-cut Diamond?
It depends on the cut parameters and length-to-width ratio, but a typical size of an 18ct marquise-cut Diamond would be around 27.22×13.61 mm (±6%). The lw ratio of this Diamond is 2. See below 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 |
81 % |
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Saved...
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Ring diameter:
16.9 mm
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Additional Info
Diamond is the hardest natural material (nothing can scratch it, but another diamond) and a very attractive and expensive gem. Diamonds can occur in a whole spectrum of colors, although white or colorless are the most popular.
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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Diamond |
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Shape:
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Marquise |
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Chemical Formula:
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C |
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Crystal Structure:
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Isometric |
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Hardness:
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10 |
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Specific Gravity
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3.52 |
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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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27.22 mm |
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Width:
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13.61 mm |
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Est. face-up size:
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263.03 mm² |
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Volume:
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1022.73 mm³ |
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Length-to-width ratio:
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2 |
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Refractive Index:
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2.417 - 2.419 |
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Luster:
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Adamantine |
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Wearability:
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Excellent |
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Care Instructions:
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No special or unusual care |
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Color:
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Diamond can be found in the following colors:
                               
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Birthstone:
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Diamond is a birthstone for the month of April |
Popular comparisons:
- 0.3ct Diamond (Marquise, White, 7 x 3.5) vs. 0.4ct Diamond (Round, White, 4.79 x 4.79)
- 0.2ct Diamond (Marquise, White, 6.08 x 3.04) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Diamond (Marquise, White, 10.38 x 5.19) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 0.5ct Diamond (Marquise, White, 8.24 x 4.12) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 0.3ct Diamond (Marquise, White, 6.96 x 3.48) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 5ct Diamond (Marquise, White, 16.85 x 9.12) vs. 5ct Diamond (Marquise, White, 16.59 x 8.86)
- 1ct Diamond (Marquise, White, 10.38 x 5.19) vs. 1ct Diamond (Emerald, White, 6.68 x 4.95)
- 0.05ct Diamond (Marquise, White, 3.82 x 1.91) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)