The company will use the symbol GEM, the same it had before taken private by Pallinghurst Resources.

Last updated in 2003, the fresh set of principles respond to increased pressure for miners to carry out socially-responsible investments and operations.

The Botswana mine has already produced six diamonds greater than 100 carats this year.

Moscow claims to a host of resources are based on shaky grounds at best, consultancy Verisk Maplecroft says.

Analysts say that while the diamond showed signs of breakage, it could fetch more than $5 million.

Mark Cutifani says that, regrettably, the mining industry is still seen as one that takes more than it gives.