The ex-wife of a wealthy Oklahoma oil tycoon plans to appeal her divorce judgment, stating that her $1 billion awarded cash and assets were well below her marital wealth. Sue Ann Hamm, formerly married to Continental Resources chief executive officer Harold Hamm, will appeal the courts' decision, according to one of her lawyers.

Sue Ann Hamm said she believes she was shortchanged after her former husband was allowed to keep roughly 94 percent of his estimated $18 billion rise in his Continental shares over the course of the their 26-year marriage. Monday's ruling was "not equitable," her lawyer Ron Barber told Reuters Thursday.

Oklahoma County Court Judge Howard Haralson ordered the CEO to pay his ex-wife $995 million, as well as giving up other assets like homes in California and Oklahoma, worth several million dollars additionally. Mr. Hamm reportedly owns more oil than any other American, and this divorce judgment was one of the largest in U.S. history. However, it seems that these proceedings are not yet over.

Harold Hamm owns 68 percent of Continental's stock, valued around $13.5 billion currently. When the divorce trial began in August, his stock was up to $18 billion but has since dropped in line with fluctuations on global oil prices. Judge Haralson ruled that $1.4 billion of the stock's growth during the Hamms' union was "marital capital" and subject to be divided. The remainder was deemed Harold's "separate property."

"Sue Ann is disappointed in the outcome of this case," Barber said. "She dedicated 25 years as Harold's faithful partner in family and business."

Sue Ann Hamm never signed a prenuptial agreement. She has 30 days from the date of the ruling, through Dec. 10, to appeal the court's decision. According to family law experts, the process could take between 18 months to several years to sort out.