Not all Tanzanites are rare. It's the ones that have an incomparable electric blue that are rare. This 12.68 carat Tanzanite is such a piece because it carries AAAA (4A) grade.
Tanzanite was discovered in 1967 in Tanzania by local herders who found blue crystals in the Merelani Hills near Arusha, Tanzania while tending livestock in 1967. These blue crystals were given to a prospector named Manuel de Souza, who registered new mining operations with the government. They all thought these were Sapphire deposits, but in fact, this discovery gave birth to one of the world's rarest gems. Tanzanite is thus, only found in this region of the world: in a strip near Mount Kilimanjaro in Tanzania. It is believed to have formed through a combination of heat and pressure during tectonic activities that occurred around 585 million years ago. Amazing isn't it?
You might not be lucky enough to invest in such top-quality Tanzanite jewelry in future, as good-quality Tanzanite is being mined and the deposits are expected to run out in the next 10 -15 years.