Many investors are also concerned about the Indonesian government's decision to implement new policies that restrict bank and mining company ownership, as well as new taxes and import restrictions that investors say seem unnecessarily protectionist.
President Jacob Zuma recently sparked a debate when he called for greater state involvement in mining and land ownership to address inequalities inherited from apartheid - which he said pose a "grave threat" to Africa's biggest economy.
Investors were alarmed and mining stocks plummeted after an initial draft of a black ownership plan for the mining sector was leaked in the middle of last year.
In addition to being a luxury jeweler and timepiece company, Harry Winston Diamond Corp. operates as a diamond mining business with a 40 percent ownership interest in the Diavik Diamond Mine.
The Indonesian government announced on March 5, 2012, that all foreign mining companies in Indonesia have 10 years to transfer their ownership by at least 51% to the Indonesian central, state and local governments.
The government approved a mining charter last October which set out a target of 15% black ownership in local mines within five years and 26% within 10 years.