This sounds like its came straight from a hollywood movie plot!
http://www.iol.co.za/news/crime-courts/trojan-horse-heist-nets-r23m-in-gems-1.1274180
A few hours before midnight on Good Friday, three men arrived at AA Diamonds in Bedfordview in an ADT vehicle. They wore ADT security uniforms, including bulletproof vests and helmets.
Several hours later they raced off with R23 million worth of precious stones – after wiping their raid off the CCTV tapes.
http://www.iol.co.za/news/crime-courts/trojan-horse-heist-nets-r23m-in-gems-1.1274180