Like a Russian nesting doll, one diamond is inside another.
A deal worth at least $60 million a year is close between Russia's largest diamond mining company and the US giant Tiffany & Co.
Giant gem goes on show as Siberian diamond company Alrosa issues a 16% stock float.
President Yegor Borisov in high level meetings in United Arab Emirates.
Massive Siberian source of diamonds formed by an asteroid 35 million years ago can 'overturn entire world gem market'.
But there are questions over privatisation of mining giant Alrosa, the world's largest producer.
At least 138 miners brought safely to surface of Alrosa's Mir complex with hopes of getting remaining men out alive.
The world's top diamond producer is on course for a $10 billion valuation, say analysts.
Gems and precious metals rain over Russia’s coldest region as police and secret services stage emergency search.