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40 Carat Sinhalite (Oval, 27.47×18.31mm, Light Brown)

Color:
light brown
actual size
40ct Sinhalite displayed at actual size of 27.47×18.31mm, (Oval cut, Light Brown
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Actual size is set for screen


How big is a 40 carat oval-cut Sinhalite?

It depends on the cut parameters and length-to-width ratio, but a typical size of a 40ct oval-cut Sinhalite would be around 27.47×18.31 mm (±6%). The lw ratio of this Sinhalite is 1.5. See below how big it looks on a ring and finger. 
Ring:
Skin tone:
Ring width: 3.0 mm
Saved...
Finger image
Ring on finger
Light Brown 40ct Sinhalite (oval cut) shown in real-world size of 27.47×18.31mm on a ring and finger
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
 109 %
Saved...
Ring diameter: 16.9 mm
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Additional Info

Sinhalite is one of the more recently discovered gemstones of earth-tone brown colors. It was first discovered in Sri Lanka in early 1950's and was named after the country – Sinhala is a Sanskrit name for Sri Lanka.

Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile

Gem Details

Name:
Sinhalite
Shape:
Oval
Chemical Formula:
MgAlBO4
Crystal Structure:
Orthorhombic
Hardness:
6-7
Specific Gravity
3.48
Carat weight:
40 ct
Gram weight:
8 g (0.2822 ounces)
Points:
4000 pts
Length:
27.47 mm
Width:
18.31 mm
Est. face-up size:
412.44 mm²
Volume:
2298.85 mm³
Length-to-width ratio:
1.5
Refractive Index:
1.665 - 1.712
Luster:
Vitreous
Wearability:
Very good
Care Instructions:
No special or unusual care
Color:
Sinhalite can be found in the following colors:
Color WhiteColor Light BrownColor Brown
Birthstone:
Sinhalite is not an official birthstone of any month

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