Rio Tinto has showcased its rare pink, red, violet and blue diamonds from the Argyle mine in Western Australia virtually to a group of collectors, connoisseurs and luxury jewellery houses.
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Largest graded fancy vivid pink diamond to go on auction
The largest internally flawless, fancy vivid pink diamond the Gemological Institute of America (GIA) has ever graded is going up for action in April this year.
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