Alrosa calls for end to $25,000 ceiling on individual diamond exports.
Gem weights in at 27.85 carats, and may become the most expensive polished diamond in the company's history.
Like a Russian nesting doll, one diamond is inside another.
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.