Diamond historical prices

[DCR]

Im looking for historical diamond and rough diamond prices. I mean price lists of previous years. Is it possible to find something like this? I want to do mathematical analisys of them.
Thanks in advance.

 

[elmo]

http://www.gemfacts.com/diadex/

You might get a better answer on the RockyTalky group at https://www.pricescope.com/idealbb/forum.asp?forumID=3.