Gaborone (Botswana), Aug 23: The largest diamond found in more than a century has been unearthed at a mine in Botswana, and the country's president showed off the fist-sized stone to the world at a viewing ceremony on Thursday.

The Botswana government says the huge 2,492-carat stone is the second-biggest ever discovered in a mine. It's the biggest diamond found since 1905.

The as-yet-unnamed diamond was presented to the world at the office of Botswana President Mokgweetsi Masisi. It weighs approximately half a kilogram and Masisi was one of the first to get to hold it.

Officials said it was too early to value it or decide how it would be sold. Another smaller diamond from the same mine in Botswana was sold for USD 63 million in 2016, a record for a rough gem.

“This is history in the making,” said Naseem Lahri, the Botswana managing director for Lucara Diamond Corp., the Canadian mining company that found the diamond. “I am very proud. It is a product of Botswana.”

Lucara said in a statement Wednesday that it recovered the “exceptional” rough diamond from its Karowe Mine in central Botswana. Lucara said it was a "high-quality" stone and was found intact. It was located using X-ray technology designed to find large diamonds.

“We are ecstatic about the recovery of this extraordinary 2,492-carat diamond,” Lucara President and CEO William Lamb said in a statement.

The weight would make it the largest diamond found in 119 years and the second-largest ever dug out of a mine after the Cullinan Diamond that was discovered in South Africa in 1905. The famous Cullinan was 3,106 carats and was cut into gems, some of which form part of the British Crown Jewels.

A bigger, less pure black diamond was discovered in Brazil in the late 1800s, but it was found above ground and was believed to have been part of a meteorite.

Botswana, a country of 2.6 million people in southern Africa, is the second-biggest producer of natural diamonds behind Russia and has unearthed all of the world's biggest stones in recent years. The Karowe Mine has produced four other diamonds over 1,000 carats in the last decade.

Before this discovery, the Sewelo diamond, which was found at the Karowe Mine in 2019, was recognised as the second-biggest mined diamond in the world at 1,758 carats. It was bought by French fashion house Louis Vuitton for an undisclosed amount.

The 1,111-carat Lesedi La Rona diamond, also from Botswana's Karowe Mine, was bought by a British jeweller for USD 53 million in 2017. Another diamond from Karowe, The Constellation, was sold for the record $63 million.

Diamonds are formed when carbon atoms are squeezed together under high pressure deep underground. Scientists say most diamonds are at least a billion years old and some of them more than 3 billion years old.

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ISLAMABAD: At least two more cases of poliovirus were reported in Pakistan, taking the number of infections to 52 so far this year, a report said on Friday.

“The Regional Reference Laboratory for Polio Eradication at the National Institute of Health has confirmed the detection of two more wild poliovirus type 1 (WPV1) cases in Pakistan," an official statement said.

The fresh infections — a boy and a girl — were reported from the Dera Ismail Khan district of Khyber-Pakhtunkhwa province.

“Genetic sequencing of the samples collected from the children is underway," the statement read. Dera Ismail Khan, one of the seven polio-endemic districts of southern Khyber Pakhtunkhwa province, has reported five polio cases so far this year.

Of the 52 cases in the country this year, 24 are from Balochistan, 13 from Sindh, 13 from Khyber Pakhtunkhwa, and one each from Punjab and Islamabad.

There is no cure for polio. Only multiple doses of the oral polio vaccine and completion of the routine vaccination schedule for all children under the age of five can keep them protected.