(IDEX Online) - A ruby described as "the largest and most valuable" ever to be auctioned is expected break the world record when it is sold by Sotheby's New York in June.The 55.22-carat Estrela de Fura ((Star of Fura in Portuguese), is "the world's largest gem-quality ruby in existence," and is "expected to achieve in excess of $30m," the auction house said.The highest price ever paid for a ruby is currently $30.3m (($1,185,451 per carat) for the 25.59-ct cushion-cut Sunrise Ruby, a Burmese gemstone which sold at Sotheby's Geneva in May 2015. It's one of only two rubies that have ever broken the $15m barrier at auction.The Estrela de Fura was recovered in Montepeuz, Mozambique, by Dubai-based miners Fura as a 101-ct rough gemstone."To see a natural ruby of this size, with such a combination of quality characteristics spared from treatment was considered almost unimaginable. The natural ruby of 55.22 ct is setting a new record not only for Mozambican rubies, but also for rubies in general," said the Gubelin gem grading lab.Quig Bruning, head of Sotheby's jewelry, Americas, said: "Estrela de Fura 55.22, is a true wonder of nature and sensational stone of perfect color and exceptional clarity, combined with a superb cushion shape. It is undoubtedly positioned to become the standard bearer for African rubies."Dev Shetty, CEO of Fura Gems, said: "From the in-depth analysis and study of the stone - through the process of cutting and polishing - we have worked with the utmost care and respect for the ruby, recognizing its importance and stature."The stone is being displayed in Hong Kong, Taipei, China, Singapore, Geneva and Dubai before it stars in Sotheby's Magnificent Jewels auction in New York on 8 June.Pic shows the polished Estrela de Fura and (inset) as a rough gem.