Known as the ‘Beyond Rare Tender’, the company will showcase 48 lots in Australia, Switzerland and Belgium, with bids closing on 20 November.
The collection includes 87 diamonds weighing 29.69 carats. Pink and red diamonds from the Argyle are paired with yellow diamonds from Diavik in northern Canada.
Sinead Kaufman, chief executive of Rio Tinto Minerals, said that the passion for fancy colours continues to burn.
"The Beyond Rare Tender is a new chapter for Rio Tinto's diamonds business and a testimony to the ongoing demand for highly collectible natural diamonds," she said.
"Rio Tinto has a rich history of innovative diamond sales and marketing events, and this carefully curated collection will be in strong demand by the world's finest jewellers, collectors and diamond connoisseurs."
The Argyle Mine in WA closed in November 2020 and was responsible for approximately 90 per cent of the world’s supply of pink diamonds.
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