Rio Tinto Diamonds announced that its Australian Trilogy, a $1.4 million (AUD$1.8 million) one-of-a-kind coin collection featuring a pink, purple pink and violet diamond from Rio Tinto’s Argyle diamond mine in the east Kimberley region of Western Australia, has been sold to an anonymous Asian collector.

The sale comes within a month of the collection being unveiled by Western Australia Premier Mark McGowan and released by the Perth Mint.

The Perth Mint has worked in collaboration with John Glajz, an authorised partner of Argyle Pink Diamonds, to create a number of limited edition gold and pink diamond ingots and coins during the past five years, which have been in strong demand from investors, collectors and diamond experts.

Saying he was delighted with the sale, Glajz added, “We have seen and continue to see, strong demand from this high end of the luxury market. The Australian Trilogy speaks the language of exclusivity, desirability and collectability.”

Rio Tinto’s Argyle Diamond Mine produces virtually the world’s entire supply of rare pink diamonds, and yet less than 0.1 per cent of the diamonds produced by the Argyle mine are pink.

The Australian Trilogy will be exhibited at The Perth Mint until the end of this month.