CNN's Dana Ford, Mariano Castillo, Shasta Darlington, Rafael Romo, Henry Hanks and Sarah Brown contributed to this report.

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Gangel's auction has a third part, a general consignment sale that includes a revolver once owned by Western legend Wyatt Earp, and the rifle Virginia Governor Henry Alexander Wise used to send famed abolitionist John Brown to the gallows in 1859.

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It has been reported Mr Brown suggested a visit could coincide with the beatification of Cardinal John Henry Newman - a famous British convert to Catholicism, who died in 1890 - expected within the next two years.

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The yellow-brown diamond in a fire rose cushion cut was purchased from De Beers by a group led by Henry Ho of Thailand and given to Thai King Bhumibol Adulyadej in honor of his 50th coronation anniversary.

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