diamonds Siberia

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.

Proceeds of a sale of a stake in Alrosa diamond giant will benefit local people, vows governor.

The Popigai reserves are enough to keep the planet in diamonds for 3,000 years.

The Siberian producer - owned mainly by the Russian state and the Sakha government - hopes to shine on the international market.

A deal worth at least $60 million a year is close between Russia's largest diamond mining company and the US giant Tiffany & Co. 

The world's top diamond producer is on course for a $10 billion valuation, say analysts.