"None of the questions have been solved so far," Yevgeny Bychkov, the head of the Russian precious metals committee, told a news conference.
He said he could give no details about the possible outcome of the talks, now due in mid-July.
Russia has a long-term agreement to sell 95 percent of its rough gem diamond exports through De Beers' Central Selling Organization. Russian diamonds accounted for 26 percent of De Beers sales last year.
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