A SET of three giant one-kilogram Australian coins have sold for a whopping $1.8 million after commanding the attention of diamond connoisseurs across the globe.

The Perth Mint announced the sale of The Australian Trilogy 2017 1 Kilogram coin collection, which describes the pieces as “an incomparable combination of precious metals and rare natural fancy coloured diamonds unearthed from the Argyle Diamond Mine in the east Kimberley Region of Western Australia”.

The three coins are gold, platinum and rose gold and portray Australia’s native animals, the kookaburra, kangaroo and koala, each set with the rarest pink and violet diamonds exclusively sourced from the Argyle Diamond Mine within its design.

“This coveted collection of diamond studded gold and platinum coins has raised the bar on the concept of ‘unique collectable’, exemplifying the quality craftsmanship for which The Perth Mint and Argyle Pink Diamonds are renowned,” said Perth Mint CEO Richard Hayes.

The collection was unveiled last month at the Mint by Western Australia premier Mark McGowan but only just sold to an anonymous Asian collector.

“In a convergence of colour and light, this extraordinary collectable embodies the essence of the Australian outback — its unique wildlife, rural landscapes and stunning natural treasures,” the Perth Mint said.

“While several discerning parties expressed interest in purchasing the rare treasure, it was sold via Glajz-THG Pte Ltd.”

The Singapore based company specialises in rare gemstones and luxury jewellery.

“The prompt sale of The Australian Trilogy again highlights the premium collectors place on exclusive items, which is what we also found with the sale of the Kimberley Treasure $1 million coin in 2016,” Mr Hayes continued.

The collection will remain on display until July 31 at the Perth Mint.