Two rare Argyle diamonds, including one of only a handful of purplish-red diamonds ever certified and a 0.74-carat pink diamond valued at $480,000, went on show in Broome at the weekend.
Just one out of every 10,000 diamonds dug out of the Kimberley mine are coloured - and red diamonds are the rarest of them all.
Lost River Diamonds merchant Clyde Jones said the tiny 0.35-carat purplish-red diamond, valued about $340,000 and produced exclusively at Argyle, was a miracle of nature.
"Very few jewellers in the world would have seen a red diamond and very few people in Australia would have seen an Argyle tender pink," Mr Jones said. The diamonds' deep hue is believed to be caused by years of extreme pressure underground.
Only about 60 red diamonds have been produced since they were discovered at Argyle in 1987 and most go out to tender overseas.
Mr Jones said just 50 people worldwide were invited each year to view tender diamonds and make sealed bids at top-secret auctions.
"It's a very exclusive tender - you can only auction for these if you're given an invitation and the only people who get to view a tender stone are those who have been invited," he said.The latest purplish-red gem is one of only six in the world to be certified by the Gemmological Institute of America.
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