2.55CT STUNNING UNTREATED COLLECTORS GEM DARK YELLOW GREEN TANZANIA KORNERUPINE

Description

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Please remember, a 100x microscopic photography system is used. The actual gem depicted is far smaller than the images. Many inclusions shown are not visible to the naked eye.
Pieces: 1
Shape: Pear Facet
Type: Kornerupine
Color: Dark Brownish Yellowish Green
Weight: 2.55 CT
Clarity: VS2+/- (Type II)
(
PLEASE; If unsure of what clarity means see chart below for a more detailed explanation also remember colored gems are graded with the naked eye and not a loupe
)
Size: 11.4 x 7.3 x 4.0 mm
Luster: Vitreous
Origin: Tanzania, Africa
Treatment: Untreated
Hardness: 6.5 - 7.0 on MOHS
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 nα=1.660 - 1.671, nβ=1.673 - 1.683 and nγ=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.
VVS 1 & 2
x
VS 1
x
VS 2
x
SI 1
x
SI 2
x
Included
Extra Fine Quality. These gems have microscopic inclusions which are difficult to slightly difficult to see under a loupe with 10x magnification.
Very Fine Quality. Small pin-pricks are just visible to the scrutiny of the close naked eye. However, the beauty of the gem is not diminished in anyway.
Fine Quality. Small pin-pricks and feathers are just visible to the scrutiny of the close naked eye. However, the overall beauty of the gem is still not diminished.
Good Quality. These gems have inclusions which are fairly easy to see to the close naked eye. However, the overall beauty of the gem is still high.
Good to Medium-High Quality. These gems have inclusions which are fairly easy to see under the close naked eye. These inclusions are usually not really visible at an arm's length.
Medium to the lower qualities. Included gems with internal features that range from eye visible to very easily seen to the naked eye.
On Aug-02-07 at 11:48:20 PDT, seller added the following information:
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