Inkalamu was discovered in the eastern part of Kagem's largest open-pit mine on October 2 by geologist Debapriya Rakshit and emerald miner Richard Kapeta, the company said.
For years, Gemfields had a pineapple-sized emerald locked in a safe as it didn't know how much it was worth.
Kolkata: Mining group Gemfields on Monday announced the discovery of a 5,655-carat emerald crystal, named Inkalamu or the lion emerald, in a mine majority owned by it in Zambia. The gemstones inside the mine reportedly formed hundreds of millions of years ago.
The London-based supplier of sustainably sourced gemstones described the precious jewel as having "remarkable clarity and a perfectly balanced golden green hue".
It was spotted on October 2 in the eastern part of the Kagem mine, where a team of miners has found luck in the past few months.
Elena Basaglia, Gemfields" gemmologist said: "We are experiencing strikingly increased demand for high-quality Zambian emeralds from the major brands, particularly in Europe, all of whom admire the rich colour and unique transparency of our gems - qualities that make them unique among emeralds.
Sale a la luz supuesto video de robo de Daniela Castro
Castro fue detenida el pasado 28 de septiembre por supuesto robo de prendas con un costo aproximado de entre 100 y 750 dólares . Además, podría tener una pena de 180 días de cárcel y realizar servicio comunitario.
Gemfields said this area of the mine has proven to be "particularly fertile" in recent months, with the Kagem team recovering a number of significant crystals there.
The naming of uncut emeralds is a tradition reserved for the rarest and most remarkable gems.
These partners work tirelessly to smooth the relationship between Africa's carnivores and local communities across vast, remote and challenging areas.
The Lion Emerald will be offered for sale at Gemfields' next auction in Singapore in November 2018 to approximately 45 approved auction partners, chosen by Gemfields for their shared values in responsible practices.
The emerald is being called "Inkalamu", which means "lion" in the local Zambia Bemba language. Gemfields last named an emerald in 2010 when it unveiled the "Insofu" or "elephant" emerald. "Given this emerald is such a rare find, it is also perfectly conceivable that the buyer will choose to purchase it as an investment".