GENEVA, Switzerland (CNN) -- A mega diamond measuring at 76.02 carats was presented for public viewing for the upcoming Christie's auction next Tuesday in Geneva, Switzerland.
The "Archduke Joseph Diamond" named after its previous owner, Archduke Joseph August of Austria (1872-1962), is the top attraction at Christie's semi-annual sale. It was first found in the Indian Golkonda's mines.
The diamond is said to be among the most precious in the world, with internally flawless clarity, reports indicate.
According to the auction house, the Archduke Joseph Diamond is the biggest and best diamond from Golkonda to be seen at an auction, with great value in collection and much room for appreciation. It has been exhibited on a travelling exhibition in New York, Hong Kong and Geneva since October last month, and attracted great attention from the investors from many countries.
Jean-Marc Lunel, Christies' Senior Jewellery Specialist said, "The estimate is on request, and between 15 and 25 million U.S. dollars, and we think it should sell, considering the interest we already have on that stone, above the mid-estimate, which is $20 million U.S. dollars."
The diamond was originally put up for auction by Christie's in 1993, with a record high bid of 6.5 million U.S. dollars at that time, which is equivalent to ten million U.S. dollars in the current climate. As dozens of years have passed, people wonder whether the diamond can be bid for at such a high price, according to reports.