My 2nd WW2 spy thriller is about diamond smuggling

For me one of the most enjoyable aspects of writing is the back ground research. With my next novel focussing on diamond smuggling I am learning about all things diamonds and came across a photo of this ultra rare violet diamond. 

More than 90 per cent of the world’s rare pink diamonds come from the Argyle Mine in Western Australia and it is the only source of hydrogen-rich violet diamonds. Violet diamonds are seldom seen and in 32 years Argyle has produced only 12 carats of polished violet diamonds.

In 2015 they discovered a 9.17 carat rough diamond that has been cut to produce the 2.83 carat polished oval shaped gem, known as The Argyle Violet. It will be the centrepiece of the 2016 Argyle Pink Diamonds Tender.

If you want it you'll need to break out the piggy bank!!! The value per carat will likely be close to a world record.