This massive 1,109-carat diamond is going up for auction

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This Massive 1,109-Carat Diamond Is Going up for Auction

Here's a rock that will weigh you down. The biggest gem-quality rough diamond discovered in the past 100 years is going up for auction.

The diamond was found in a Botswana mine last year. It's called "Lesedi la Rona," which means "our light" in the country's national language.

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Sotheby's says the diamond is about the size of a tennis ball, weighing a whopping 1,109 carats.

The only diamond ever found that was larger in size is the Cullinan diamond, which weighed more than 3,000 carats before it was cut down into nine smaller pieces. They were then built into the U.K.'s crown jewels.

Get a closer look at the Lesedi la Rona diamond going up for auction:

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Lesedi la Rona diamond going up for auction at Sotheby's
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Lesedi la Rona diamond going up for auction at Sotheby's
NEW YORK, NY - MAY 04: The 1109-carat rough Lesedi La Rona diamond, the biggest rough diamond discovered in more than a century, sits in a display case at Sotheby's on May 4, 2016 in New York City. The stone was found by Lucara Diamond Corp. last year at its Karowe mine in Botswana. The diamond, which is nearly the size of a tennis ball at 66.4 x 55 x 42mm and is believed to be about 2.5 billion to 3 billion years old, was named 'Our Light' in the local Tswana language. Lesedi La Rona will be offered at auction in London on June 29 and be on display at Sotheby's New York. The diamond could sell for $70 million or more. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - MAY 04: Guards stand next to the 1109-carat rough Lesedi La Rona diamond, the biggest rough diamond discovered in more than a century, at Sotheby's on May 04, 2016 in New York City. The stone was found by Lucara Diamond Corp. last year at its Karowe mine in Botswana. The diamond, which is nearly the size of a tennis ball at 66.4 x 55 x 42 mm and is believed to be about 2.5 billion to 3 billion years old, was named 'Our Light' in the local Tswana language. Lesedi La Rona will be offered at auction in London on June 29 and be on display at Sotheby's New York. The diamond could sell for $70 million or more. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - MAY 04: Guards stand next to the 1109-carat rough Lesedi La Rona diamond, the biggest rough diamond discovered in more than a century, at Sotheby's on May 04, 2016 in New York City. The stone was found by Lucara Diamond Corp. last year at its Karowe mine in Botswana. The diamond, which is nearly the size of a tennis ball at 66.4 x 55 x 42 mm and is believed to be about 2.5 billion to 3 billion years old, was named 'Our Light' in the local Tswana language. Lesedi La Rona will be offered at auction in London on June 29 and be on display at Sotheby's New York. The diamond could sell for $70 million or more. (Photo by Spencer Platt/Getty Images)
A model poses with an uncut 1109-carat diamond named 'Lesedi La Rona', estimated to realise in excess of 70 million USD (49.5 million GBP, 62 million euro), at Sotheby's auction house in London, on June 14, 2016. The large gem-quality rough diamond will be offered in a stand-alone auction at Sotheby's in London on June 29. / AFP / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)
A model poses with an uncut 1109-carat diamond named 'Lesedi La Rona', estimated to realise in excess of 70 million USD (49.5 million GBP, 62 million euro), at Sotheby's auction house in London, on June 14, 2016. The large gem-quality rough diamond will be offered in a stand-alone auction at Sotheby's in London on June 29. / AFP / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)
A model holds the 1,109 carat LESEDI LA RONA diamond May 4, 2016 at Sotheby's in New York. The rough diamond, uncovered in Botswana, southern Africa, last year estimated to be three billion years old, will be offered in a stand-alone auction in London on June 29, 2016, estimated to sell for in excess of $70 million USD. / AFP / DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
A model holds the 1,109 carat LESEDI LA RONA diamond May 4, 2016 at Sotheby's in New York. The rough diamond, uncovered in Botswana, southern Africa, last year estimated to be three billion years old, will be offered in a stand-alone auction in London on June 29, 2016, estimated to sell for in excess of $70 million USD. / AFP / DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
A model holds the 1,109 carat LESEDI LA RONA diamond May 4, 2016 at Sotheby's in New York. The rough diamond, uncovered in Botswana, southern Africa, last year estimated to be three billion years old, will be offered in a stand-alone auction in London on June 29, 2016, estimated to sell for in excess of $70 million USD. / AFP / DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
A model holds the 1,109 carat LESEDI LA RONA diamond May 4, 2016 at Sotheby's in New York. The rough diamond, uncovered in Botswana, southern Africa, last year estimated to be three billion years old, will be offered in a stand-alone auction in London on June 29, 2016, estimated to sell for in excess of $70 million USD. / AFP / DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
The 1,109-carat LESEDI LA RONA diamond is displayed May 4, 2016 at Sotheby's in New York. The rough diamond, uncovered in Botswana, southern Africa, last year estimated to be three billion years old, will be offered in a stand-alone auction in London on June 29, 2016, estimated to sell for in excess of $70 million USD. / AFP / DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
NEW YORK, NY - MAY 03: (This image has been digitally altered) A view of the 1,109-carat 'Lesedi la Rona': the largest gem-quality rough diamond to be discovered in over a century, and the largest rough diamond in existence today, at Sothebys, New York, NY, on May 3, 2016. The 'Lesedi la Rona' will be auctioned at Sothebys London on 29 June 2016, estimated to sell for in excess of $70 million. (Photo by Donald Bowers/Getty Images for Sotheby's)
A model displays a large diamond at Sotheby's in New York, Wednesday, May 4, 2016. The auction house plans to offer the Lesedi la Rona diamond in London on June 29. (AP Photo/Seth Wenig)
A large diamond is displayed at Sotheby's in New York, Wednesday, May 4, 2016. The auction house plans to offer the Lesedi la Rona diamond in London on June 29. (AP Photo/Seth Wenig)
A model displays a large diamond at Sotheby's in New York, Wednesday, May 4, 2016. A 3-billion-year-old diamond the size of a tennis ball â the largest discovered in over a century â could sell for more than $70 million, auctioneer Sotheby's said Wednesday. The auction house plans to offer the Lesedi la Rona diamond in London on June 29. (AP Photo/Seth Wenig)
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But Sotheby's reports, when polished and cut, the Lesedi la Rona diamond could be the largest top-quality diamond ever, surpassing the Great Star of Africa, which weighs 530 carats.

The diamond, which could be as many as 3 billion years old, goes up for auction June 29.

Now, check out a rare pink diamond that was sold at Sotheby's auction:

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Rare pink diamond sold at Sotheby's auction
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Rare pink diamond sold at Sotheby's auction
An assistant poses with a 15.38 carat vivid pink diamond at Sotheby's auction house in London, Britain April 7, 2016. REUTERS/Neil Hall
An assistant poses with a 15.38 carat vivid pink diamond at Sotheby's auction house in London, Britain April 7, 2016. REUTERS/Neil Hall
A model poses with "The Unique Pink" diamond mounted during a preview at Sotheby's auction house in Geneva, Switzerland May 9, 2016. The supremely rare and exceptional Fancy Vivid Pink diamond, weighting 15.38 carats, is estimated to sell for US $ 28 to 38 million, when auctioned during the Magnificent Jewels and Noble Jewels auction in Geneva on May 17. REUTERS/Denis Balibouse
A model poses with the "Unique Pink", a 15.38 carats vivid pink diamond, at Sotheby's auction house in Geneva, Switzerland May 9, 2016. REUTERS/Denis Balibouse/File Photo
A model poses with "The Unique Pink" diamond mounted during a preview at Sotheby's auction house in Geneva, Switzerland May 9, 2016. The supremely rare and exceptional Fancy Vivid Pink diamond, weighting 15.38 carats, is estimated to sell for US $ 28 to 38 million, when auctioned during the Magnificent Jewels and Noble Jewels auction in Geneva on May 17. REUTERS/Denis Balibouse
A model poses with "The Unique Pink" diamond mounted during a preview at Sotheby's auction house in Geneva, Switzerland May 9, 2016. The supremely rare and exceptional Fancy Vivid Pink diamond, weighting 15.38 carats, is estimated to sell for US $ 28 to 38 million, when auctioned during the Magnificent Jewels and Noble Jewels auction in Geneva on May 17. REUTERS/Denis Balibouse
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