Skip to content


Your cart is empty


Mount Kilimanjaro with the grass lands in front of the mountain

Tanzanite Formation

Five hundred and eighty-five million years ago, in the foothills of Mount Kilimanjaro, Mother Nature yielded her most precious of all gems. As testimony to its rarity, it remained unknown until 1967 when it was discovered at what is still the world's only known source – Tanzania.
Significant tectonic plate activity and intense heat formed Mount Kilimanjaro, and in this process, the Mozambique Orogenic Belt (one of the most mineral-rich places on Earth), was formed as well. It is believed that it was during this process that rough Tanzanite was formed. The process is known as regional metamorphism and can be explained as follows: when tectonic plates collide with one another, the igneous rocks (rocks formed through the cooling and solidification of magma/lava) of each tectonic plate are morphed into one another using extreme pressure.

The rocks reach near melting point, and when this happens, they produce beautiful crystal structures. In this process, gems are formed, essentially, from the coming together of two plates. Each of the two plates can contain a variety of different minerals, and because of this, combinations that are specific to one area may occur. This explains why Tanzanite is only found in one area in the world. The morphing together of two tectonic plates in this specific area of Tanzania resulted in a particular mix that has not been discovered anywhere else in the world.

Shop Tanzanite Jewellery
A Collection of Rough Tanzanite grouped together

The conditions that created the Tanzanite deposit at the foothills of Mount Kilimanjaro are thought to be so unique, that geologists believe the chances of another batch of tanzanite being created are only about one in one million.
Among the local people of Tanzania, various stories and myths exist as to how this precious gem came about. It is popularly believed that Tanzanite was formed by an act of God when he used lightning strikes to set the surrounding hills alight. After the fires burnt out and the earth cooled down, the rocks deep inside the earth turned blue. The gem is also believed to carry unique spiritual properties, with local Tanzanian people believing that tanzanite heightens spiritual growth.

Tanzanite rings are often worn for protection and the gem's alleged calming and soothing properties. Due to the uniqueness of its formation, its rarity, and its unrivaled beauty, Tanzanite has become a sought-after gem all around the world. Discover the Ayanda Tanzanite jewellery collection for buying Tanzanite in South Africa.

Shimansky Cut Tanzanite sitting on black charcoal.

Attributes of Tanzanite

  • Rarity: Tanzanite’s only known source in the world is a 4km strip of land near Mount Kilimanjaro, northern Tanzania. This single, limited source renders Tanzanite at least a thousand times more than diamonds. With only one known source to date, it is predicted that within the next 10 – 12 years no more gem-quality tanzanite will be found.
  • Colour: Tanzanite is uniquely trichroic. This means that in its rough form, it radiates three different colours from each of its crystallographic axes: blue, violet and burgundy. Once cut and polished, Tanzanite ranges from electric violets to vibrant blues, deep royals and rich indigos. The colour of Tanzanite is strongly related to the presence of vanadium and titanium in its crystallographic structure.
Exclusive Ayanda Tanzanite and Diamond Engagement Ring
  • African mystique: Its geology is so unique that the chances of Tanzanite occurring elsewhere in the world are unlikely. Tanzanite’s exclusively African heritage and the alluring narrative of its discovery have proved to be a unique selling feature. Tanzanite jewellery is a particularly attractive investment for foreigners visiting the African continent, as it allows them to take home, something that is uniquely African.
  • Investment value: There is no other investment that will yield as great a return as investing in tanzanite of the highest quality. It is more likely to increase in value as supply gets less and demand increases.

The true value of a Shimansky jewellery creation is only realised when it is worn by the person it is meant for.

An assortment of various cuts of Tanzanite.

Shaping Beauty

From the classic round brilliant cut, trilliant, oval to a romantic heart shape Tanzanite, Shimansky cut and polish any shape you desire. Ranging from 1ct up to 100ct, to be set in a unique jewellery design of your choice or as an investment gem for your collection.

The most important factor in gemstones is the colour and its even distribution which can only be achieved through the art of rough planning, cutting and polishing that maximises the gemstone's full potential.

Shimansky Tanzanite Cutting and Polishing

World's Best Tanzanite

We promise that the Shimansky Tanzanite is the best in the world for its colour, quality of the cut and polish and vibrancy, each tanzanite is hand-selected and inspected before and after being set into the jewellery creation with quality assurance every step of the way, making the Shimansky Tanzanite in a league of their own, your eyes will see the difference instantly.

Shop Tanzanite Jewellery