Photographic & Video Logs of
TZC1377

Log of TZC1377 on completion of cutting
Cut Shape : Trillion

TableViewImage

Video Log of TZC1377 on completion of cutting


Log of TZC1377 in its rough state

Rough Image

ID # TZC1377

Geological History

The Merelani Mining area beneath Mount Kilimanjaro is the only known source of Tanzanite in the world. This makes the stone considerably rarer than Diamonds and one with a finite resource. It is believed that the eruption of Mount Kilimanjaro was responsible for setting off the unique set of conditions in the earth which caused Tanzanite to form.

Whilst the formation of blue Tanzanite was caused by the presence of Vanadium in the earth, the presence of other minerals caused a very rare occurrence of other colors to form too. These wonderful “fancy color Tanzanites” (as they are known in the trade) are very seldom found as the minerals that were responsible for their color were only present in minute quantities at the time of formation. Crystals with colors other than blue include pink, orange and a variety of greens. They are very rare and much sought after gemstones.

This gorgeous Fancy Tanzanite is one of a very few produced in a very small window of the earth's history. It was formed 500 million years ago. The host rock it formed in are late Proterozoic metasediments that were originally a series of sands and clays rich in organic matter with elevated levels of uranium, vanadium and aluminium rich minerals. These sediments were highly weathered and deposited in a lake.

During and after the Pan-African tectono-thermal (mountain building) metamorphism a release and migration of hydrothermal fluids took place. The result was the deposition from these fluids of calcium, magnesium, vanadium, uranium, strontium and Zinc as well as heavy rare earth elements Co2 and SO3 along the Lelatema fault zone into chocolate tablet shaped boudin structures.

This rare Fancy color Tanzanite was amongst a number of crystals that formed in this structure as a result of the enormous geological events that formed the mighty Mount Kilimanjaro. It lay there for hundreds of millions of years until it was discovered by independent Tanzanite miners as they explored deep into the earth's surface. The rough crystal found its way to Lapigems Gem Company's offices nearby in Nairobi where it was cut by our master cutters to release its inner fire. Five hundred million years after its conception this lovely, rare crystal finds itself in human hands.

Gemstone Reports And Certification

This gemstone has several reports prepared for it by a GIA Gemologist and these reports are shipped with it.

Gemstone Grading Certificate

This certificate is a full and detailed grading report utilizing the Gemological Institute of America Grading system.

 View the certificate for this gemstone

 Learn about the certificate

Personalized History and Registration Report

 View and Print the History Report

This report has been prepared by a GIA Gemologist at Lapigems Gem Company. All gemological tests were performed using current techniques and using current gemological equipment. The gemstone here reported is certified and this report, combined with the printed photo-certificate constitutes a thorough certification of this gemstone from mine to private owner.

Private Ownership Registration
Registered on www.lapigems.com worldwide gemstone registration service. Registration information only available by password to account holder.

If you purchase this gemstone, full ownership registration and this history information will be stored in your account as a personalized Gem History & Ownership Report

Quality Report

 
Color - 4
Clarity - 4
Cut - 3.5
Rarity - 4


How are these quality allocations reached?

Color Clarity Cut Rarity

Gemstone Grading Report

The gemstone here described has been identified as a natural gemstone and has the following description :

Description : Faceted African Fancy Green Tanzanite
Weight : 1.28 carats
Shape : Trillion
GIA Color Grade : vslyG 5/5more info
GIA Clarity Grade : VVSmore info
Species : Zoisite
Variety : Fancy Tanzanite
Refractive Index : 1.691
Cause of Color : Chromium / Manganese
Specific Gravity : 3.35
Optic Character : DR Biaxial
Crystal System : Orthorhombic
Treatments : None
Country of Origin : Tanzania, East Africa

Mining Report

Date Mined : 1st March 2007
Mining Location : Merelani, Mt Kilimanjaro, Tanzania
Type of Source : Primary
Mining Method : Open Cast
Host Rock : Graphite & Quartz Gneisses
Chemical Composition of rough : Calcium Alluminium Silicate

Gemological Testing Methodology

Gemological Tests performed on this gemstone by a GIA Gemologist include but are not limited to:

Refractive Index, Specific Gravity, Pleochroism, Polariscope to ascertain Optic Character, Spectroscope to ascertain spectrum, Magnification with GIA Microscope using darkfield lighting, Chelsea Filter, Ultraviolet Flourescence.





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Lapigems Gem Company is a member of / staff hold qualifications from the following leading Gemological Organizations

 

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