(IDEX Online) – An extremely rare 93-ct black diamond has gone on display at London’s Natural History Museum.

The rough diamond, which weighed over 300 carats, is thought to have originated in Brazil. 

It was acquired by the lender’s family during the late 1800s in Goa, India – a well-known gem cutting center at the time. Click here to read full article. http://www.idexonline.com/FullArticle?Id=47070