Named the Argyle Pink Jubilee, the huge rough stone was found at Rio’s pink diamond operations in the Kimberley region of western Australia and would take 10 days to cut and polish, the miner said.
“This rare diamond is generating incredible excitement,” said Josephine Johnson from Rio’s Argyle Pink Diamonds division.
“A diamond of this calibre is unprecedented — it has taken 26 years of Argyle production to unearth this stone and we may never see one like this again.
“The individual who gets to wear this remarkable pink diamond will be incredibly lucky indeed.”
Though it would not speculate on how much the Jubilee was worth, Rio said extremely high-quality pink diamonds could fetch in excess of US$1m per carat, meaning it is likely to go for at least US$10m.
Rio produces more than 90% of the world’s pink diamonds from the Argyle mine, and said large stones like the Jubilee typically went to museums, were gifted to royalty or end up at prestigious auction houses like Christie’s.
Christie’s had only auctioned 18 polished pink diamonds larger than 10 carats in its 244-year history, Rio added.
Soaring demand for the extremely rare jewel has seen pink diamond prices skyrocket in the past 20 years, and they are now among “the most concentrated forms of wealth on earth and well in excess of white diamonds,” Rio said.
The miner describes it as an “elite and discrete” market with buyers including royalty, heads of state, celebrities and “other very wealthy individuals.”
When the Jubilee diamond has been cut and polished it will be graded by international experts and showcased globally in private settings before being sold by invitation-only tender later this year.
It is not known how the diamonds acquire their pink tinge but it is thought to come from a molecular structure distortion as the jewel forms in the earth’s crust or ascends to the surface.