Photographic & Video Logs of

Log of RHDC572 on completion of cutting
Cut Shape : Matched Pairs


Video Log of RHDC572 on completion of cutting

HD VIDEO taken in Natural North Daylight (approx 5500 Kelvin). This movie has been professionally videoed and is of the actual piece represented.
We do not use stock videos.

Log of RHDC572 in its rough state

Rough Image

ID # RHDC572

Geological History

Near the small village of Mnazi, in the Usambara Mountains of Tanzania, a dirt track winds down the valley following the northern tributary of the famous Umba River. From here the road heads southwards and then eastwards to the Gerevi Hills. As the Umba River meanders through these hills it has for centuries deposited a gem gravel on the twists and bends of the river. It is among these deposits that these beautiful Rhodolites were found. They began “life” however many millions of years ago with a process called metamorphism. As magma pushed its way up through the existing rock the contact between the invading magma and the older rock caused a change to occur. The intense heat made the nearby minerals recrystallize into minerals stable at the higher temperature. These garnets were amongst these. Many millions of years later, as the Umba river eroded away the rock in its charge towards the Indian Ocean, they were dislodged from the rock in which they had formed and carried with the river. During this time, they were tumbled ferociously and rubbed and smashed against other rocks until their surfaces were smooth and most of the cracks and blemished in the crystals were broken off and worn down. The crystals was at some point deposited in the silts on one of the bends of the river near the Gerevi Hills. Here, they were panned out of the river by miners panning for gems and taken to Nairobi to be bartered at the local dealer’s offices. They found their way to Lapigems Gem Company, where they were bought and cut into the beautiful matched pair you see on the left of the screen.

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

Mining & Geology Report

 View the Mining and Geology Report for this gemstone

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 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 - 4
Rarity - 3.5

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 Rhodolite Garnet
Weight : 4.49 carats
Shape : Matched Pairs
GIA Color Grade : slpR 6/5more info
GIA Clarity Grade : VVSmore info
Species : Garnet
Variety : Rhodolite Garnet
Refractive Index : 1.762
Cause of Color : Iron
Specific Gravity : 3.84
Optic Character : SR
Crystal System : Cubic
Treatments : None
Country of Origin : Tanzania, East Africa

Mining Report

Date Mined : 16 January, 2019
Mining Location : Kangala, Tanzania
Explore the Mining Location : MAP | SATELLITE | TERRAIN
Type of Source : Primary / Alluvial
Mining Method : Open Cast / Panning
Host Rock : Quartz / Mica
Chemical Composition of rough : Manganese 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