18 Carat Hiddenite (Marquise, 27.5×13.75mm, Light Green )
Color:
Actual size is set for screen
How big is an 18 carat marquise-cut Hiddenite?
It depends on the cut parameters and length-to-width ratio, but a typical size of an 18ct marquise-cut Hiddenite would be around 27.5×13.75 mm (±6%). The lw ratio of this Hiddenite 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 |
82 % |
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Saved...
|
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Ring diameter:
16.9 mm
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Additional Info
Hiddenite is a yellowish-green or emerald-green variety of the Spodumene mineral family. It was named after its discoverer William Earl Hidden (1853–1918). Most valued gems are those of rich green color.
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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Hiddenite |
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Mineral Group:
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Spodumene |
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Shape:
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Marquise |
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Chemical Formula:
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LiAlSi2O6 |
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Crystal Structure:
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Monoclinic |
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Hardness:
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6.5 - 7 |
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Specific Gravity
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3.18 |
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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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27.5 mm |
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Width:
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13.75 mm |
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Est. face-up size:
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268.47 mm² |
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Volume:
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1132.08 mm³ |
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Length-to-width ratio:
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2 |
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Refractive Index:
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1.66 - 1.68 |
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Luster:
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Vitreous |
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Wearability:
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Very good |
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Care Instructions:
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Avoid ultrasonic or steam cleaners |
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Color:
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Hiddenite can be found in the following colors:
  
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Birthstone:
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Hiddenite is not an official birthstone of any month |
Popular comparisons:
- 10ct Hiddenite (Marquise, Green, 22.96 x 11.48) vs. 10ct Emerald (Marquise, Green, 24.24 x 12.12)
- 1.02ct Hiddenite (Marquise, Light Green , 10.72 x 5.36) vs. 1.5ct Emerald (Round, Green, 7.8 x 7.8)
- 40ct Hiddenite (Marquise, Green, 36.44 x 18.22) vs. 40ct Emerald (Marquise, Green, 38.48 x 19.24)
- 1ct Hiddenite (Marquise, Green, 10.66 x 5.33) vs. 1ct Emerald (Marquise, Green, 11.26 x 5.63)
- 2.7ct Ruby (Pear, Red, 10 x 7) vs. 3ct Ruby (Emerald, Red, 9 x 7)
- 1.5ct Tourmaline (Round, Light Red, 7.45 x 7.45) vs. 1.5ct Sapphire (Round, Light Blue, 6.84 x 6.84)
- 1ct Kyanite (Oval, Blue, 7.77 x 5.18) vs. 1ct Tanzanite (Oval, Blue, 8.07 x 5.38)
- 1ct Aquamarine (Oval, Light Blue, 8 x 6) vs. 1ct Spinel (Oval, Gray, 8 x 6)