CERTIFIED KONERUPINE BROWNISH YELLOW 5.97 CTS -SRI LANKA LOOSE GEMSTONE - 12911

Description

Cresla Gemstore
KONERUPINE BROWNISH YELLOW 5.97 CTS 12911
RARE COLLECTORS GEM
Carats
5.97
Size
13.1 x 9.5 mm
Color
Golden Brown
Clarity
VVSI
Shape
Oval
Treatment
None
Origin
Sri Lanka
Location
Sri Lanka
Price
$ 690.00
Description
100% Natural - Not treated in any way.
Rare Collectors Gem.
Suitable for Museums,Institutions and Students of Gemology.
Will make a Gorgeous Ring or Pendent accented with Diamonds.
Gem with High Luster and Good Clarity.
A Gem of Lasting Beauty.
Refractive Index: 1.665 – 1.683 Hardness: 6.50 Chemical Comp : Mg4(Al, Fe)6(Si, Al, B)5O21(OH), Density: 3.25 - 3.35 Crystal Group: Orthorhombic
Kornerupine is a rare gem, Sri lanka is the main source country. This gem is pleochroic and comes in Green brown and yellow green.Kornerupine is a rare boro-silicate mineral with the formula (Mg,Fe2+)4(Al,Fe3+)6(SiO4,BO4)5(O,OH)2. It crystallizes in the orthorhombic - dipyramidal crystal system as brown, green, yellow to colorless slender tourmaline like prisms or in massive fibrous forms. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.34. Its indices of refraction are na=1.660 - 1.671, nß=1.673 - 1.683 and n?=1.674 - 1.684. It occurs in boron-rich volcanic and sedimentary rocks which have undergone high grade metamorphism. It is also found in metamorphosed anorthosite complexes.Kornerupine is valued as a gemstone when it is found in translucent green to yellow shades. The emerald green varieties are especially sought after.
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