A Sotherby's  employee holds the Lesedi La Rona Diamond.

'Tennis ball' diamond could fetch $92m

"Lesedi la Rona," the largest gem-quality rough diamond discovered in more than 100 years, will be auctioned in London next month and is expected to sell for $US70 million.

This week's top luxury picks

A Tag Heuer watch that's smart as well as bright, a Balenciaga eau de parfum and David Hockney: what could be a sweeter Autumn week?

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