Definition: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
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 A 1,111 carat gem-quality diamond, second in size only to the Cullinan diamond cut into the British Crown jewels, has been unearthed by Lucara Diamond Corp. in Botswana. 
  
 The Type-IIa stone, just smaller than a tennis ball, is the largest diamond discovery for more than 100 years, according to Vancouver-based Lucara. It was recovered by machines at the south lobe of Karowe mine in central Botswana, the company said in a statement. 
  
 1,111 carat diamond discovery Source: Portland Communications 
  
 "We’ve always thought very highly of our resource," William Lamb, chief executive officer of Lucara, said on a call with investors Thursday. “You’d have to be a very brave person to predict a stone like this.” 
  
 Lucara’s Karowe mine in Botswana is rivaling Gem Diamonds Ltd.’s Letseng operation in Lesotho as a source of the world’s biggest and best stones. Gem Diamonds previously held the record for the largest discovered this century with the 603-carat Lesotho Promise. 
  
 "It is almost impossible to estimate a value for such an extraordinary stone given that a valuation is highly dependent on the color, clarity and cutting and polishing characteristics," Edward Sterck, a London-based analyst at BMO Capital Markets, wrote in a note Thursday. 
  
 Lucara sold a 341.9-carat Type-IIa diamond in July for $20.6 million, or $60,000 a carat, Sterck said. The company’s shares jumped as much as 37 percent in Toronto trading, the steepest intraday gain since 2008. 
  
 The value of the find and who will want to buy it will depend on the size and quality of the polished stones that can be cut from it. While Lucara will likely sell it at a tender in Botswana, the cutting, polishing and eventual sale to a final owner may take many years. Antwerp and New York are the leading cutting centers for exceptional gems. 
  
 Stone’s Value 
  
 Lamb said it’s unlikely the stone will be sold this year. It’s too big to fit in their scanner and will have to be taken to Antwerp where he hope’s there will be a larger scanner. 
  
 “We need to see how best we can actually get maximum value for the stone,” Lamb said. “It’s going to take time for us to get a full understanding of the stone.” 
  
 Typically, a jeweler such as Graff Diamonds Corp. or a group of investors would buy the gem and use computerized scanning technology to decide how to most profitably cut the stone into several pieces and mount them in jewelry, according to Maurice Mason, a mining analyst at Stifel Nicolaus Europe Ltd. in London. 
  
 Graff is the most prolific buyer of big stones, including Gem Diamonds’s Lesotho Promise, for which it paid $12.4 million for. Graff cut it into 26 flawless diamonds, including a 76.4 carat pear-shaped gem, and fashioned them into a single necklace. The necklace hasn’t yet been sold. The Cullinan was cut by hand into nine major stones and 96 smaller ones. 
  
 "The end-buyer will likely be an ultra-ultra high-net-worth diamond collector," said Martin Potts, a London-based mining analyst at FinnCap Ltd. "There will be huge prestige in owning the largest diamond that’s not part of a royal collection." 
  
 Sotheby’s Auction 
  
 Last week, Hong Kong billionaire Joseph Lau paid 48.6 million Swiss francs ($48.4 million) at Sotheby’s in Geneva for a 12.03-carat blue diamond, the most spent on a jewel at auction. A day earlier, he paid 28.7 million francs for a 16.08-carat pink diamond. Both purchases were for his 7 year-old daughter, his office said. 
  
 So far, the largest diamonds are resisting a price slump that has hit the wider industry. Prices for Gem Diamonds’ stones that are larger than 10 carats have fallen about 5 percent in the past year, Chief Executive Officer Clifford Elphick said last week. That compares with declines of as much as 30 percent for some smaller gems. 
  
 The biggest diamond discovered is the 3,106-carat Cullinan, found near Pretoria in South Africa in 1905. It was cut to form the Great Star of Africa and the Lesser Star of Africa, which are set in the Crown Jewels of Britain. 
  
 Lucara also said it found two other very large white diamonds. The first weighs 813 carats before cleaning, meaning it’s likely to rank among the 10 largest found. The second is 374 carats. 
  
 “This is a balance-sheet-changing development ” for Lucara, Investec Plc said in a note on Thursday. ||||| Image copyright Lucian Coman/Lucara Image caption The stone measures 65mm x 56mm x 40mm in size 
  
 The world's second-largest gem quality diamond has been discovered in Botswana, the Lucara Diamond firm says. 
  
 The 1,111-carat stone was recovered from its Karowe mine, about 500km (300 miles) north of the capital, Gaborone. 
  
 It is the biggest diamond to be discovered in Botswana and the largest find in more than a century. 
  
 The 3,106-carat Cullinan diamond was found in South Africa in 1905 and cut into nine separate stones, many of which are in the British Crown Jewels. 
  
 "The significance of the recovery of a gem quality stone larger than 1,000 carats, the largest for more than a century... cannot be overstated," William Lamb, the CEO of Lucara Diamond, a Canadian diamond producer, said in a statement. 
  
 Lucara says two other "exceptional" white diamonds - an 813-carat stone and a 374-carat stone - were also found at the Karowe mine. 
  
 "This has been an amazing week for Lucara with the recovery of the second largest and also the sixth largest gem quality diamonds ever mined," Mr Lamb said. 
  
 The stone is yet to be evaluated, but commodities and mining analyst Kieron Hodgson, told AFP news agency that "the potential to be one very expensive diamond." 
  
 In April a flawless 100-carat diamond was sold for $22.1m (£14.8m) at Sotheby's in New York. 
  
 The gem, originally mined in South Africa, had taken more than a year to cut, polish and perfect. 
  
 Botswana is the world's largest producer of diamonds and the trade has transformed it into a middle-income nation. |||||
Output:
Canadian mining outfit Lucara Diamond has just uncovered the world's second-largest diamond—and the biggest one found in more than a century. Found in the south lobe of the Karowe mine in central Botswana, the Type IIa stone is 1,111 carats and just slightly smaller than a tennis ball, reports Bloomberg. Only the 3,106-carat Cullinan Diamond among the British Crown Jewels, found in South Africa in 1905, is bigger; the largest diamond found in the last 100 years was a 603-carat stone. However, that find has now been shuffled to third place, thanks to a second diamond newly found in Karowe that's 813 carats, reports the BBC. A 374-carat stone was also found. "I am truly at a loss for words," Lucara's CEO says. "The significance of the recovery of a gem-quality stone larger than 1,000 carats, the largest for more than a century, and the continued recovery of high-quality stones from the south lobe, cannot be overstated." So what is this rare rock worth? "It is almost impossible to estimate a value for such an extraordinary stone given that a valuation is highly dependent on the color, clarity, and cutting and polishing characteristics," an analyst says. Bloomberg notes that Lucara sold a 341.9-carat stone in July for $20.6 million. Others tell the Financial Times that the find is "a balance sheet changing development" for Lucara, which recently made large diamonds its focus. (This blue diamond, a daughter's birthday gift, just sold for a record amount at auction.)