I know I heard a scandal about diamonds and the diamond mine owner that Trump appointed and has since quit, on the Rachel Maddow Show but its about a year ago and hazy.
So you got me. I think the scandal concerns Indonesia and its President meeting with Trump, but not Malaysia.

Geologically Indonesia is a good candidate for diamonds due to upwelling magma as in Siberia and Africa. One ought to find diamonds all around the ring of fire. Wanna prospect?