Exports of rough diamonds in the year also surged. The volume of the said exports reached 68.266 million or an increase of 12 percent on y-o-y basis. This culminated into a value of $7.296 billion, or a 6 percent increase on y-o-y basis, reports add. The per-carat price was at $106.88, dropping 5 percent, reports suggest. Also, the net rough imports between 2012-2013, decreased 5 percent to $2.179 billion, reports add.