The rough stone is dubbed the Argyle Pink Jubilee and is undergoing 10 days of cutting and polishing.
It’s about half the polished weight of the similarly colored Williamson Pink, given to Britain’s Queen Elizabeth II as a wedding gift following its discovery on the surface in 1947 by a young boy in what is now known as Tanzania.
“A diamond of this caliber is unprecedented — it has taken 26 years of Argyle production to unearth this stone and we may never see one like this again,” said company spokeswoman Josephine Johnson.
The stone is likely to be showcased around the world before being sold at an invitation-only auction later this year.
Photo: Rio Tinto