Turkey is one of the largest customers for Iranian oil and a major buyer of its natural gas, with about a fifth of its gas supplies coming from Iran.
Ankara is seeking a discount on gas prices, arguing that they are unsustainable.
"Turkey purchases the most expensive natural gas from Iran among other suppliers," Energy Minister Taner Yildiz told reporters on the sidelines of a business forum in Ankara attended by Iranian President Hassan Rouhani.
Turkish and Iranian ministers held extensive talks late yesterday on the issue but officials said Tehran has so far refused to slash its prices.
Yildiz said an Iranian delegation would visit Turkey next week for further discussions.
"The talks will continue to hammer out a formula on the pricing," said a spokesman for the Iranian embassy in Ankara.
"I believe the two sides will find a common ground but I don't know when," he told AFP.
Turkey's state-owned pipeline company BOTAS lodged a complaint against Iran at an international court in Switzerland in 2012, arguing that the price paid to Iran for gas imports was too high.
Yildiz today said he hoped that the case would be concluded by the end of this year.
Turkish officials say Iran has called Turkey to drop the arbitration case at the Swiss court in return for talks on the price of the natural gas but Ankara has insisted on having the pricing negotiations proceed independent from the court process.
The two countries are keen on boosting their trade from around USD 14.5 billion in 2013 to USD 30 billion in 2015.
"Political risks are diminishing in Iran, which offers a unique opportunity for investors," Rouhani told the business forum in Ankara.
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