Alrosa calls for end to $25,000 ceiling on individual diamond exports.
Giant gem goes on show as Siberian diamond company Alrosa issues a 16% stock float.
A 44 per cent decline in diamond production was announced by Russian gem producer Alrosa.
The Popigai reserves are enough to keep the planet in diamonds for 3,000 years.
A deal worth at least $60 million a year is close between Russia's largest diamond mining company and the US giant Tiffany & Co.
President Yegor Borisov in high level meetings in United Arab Emirates.
Sparkling discovery of precious gems in solidified lava of Tolbachik flare-up.
Massive Siberian source of diamonds formed by an asteroid 35 million years ago can 'overturn entire world gem market'.
Diamonds of Yakutia found a fake gem - and the real $107,000 jewel vanished.