The long-awaited closure of Rio Tinto’s Argyle diamond mine in Australia is nearing, and a number of producers of lower-quality diamonds are anticipating improved prices for their stones once this happens.

Argyle in Western Australia is a major source of the world’s rough diamonds, described by various analysts as one of the key reasons there is a glut of smaller, lower-quality diamonds, with more than three-quarters of its output of about 14-million carats falling into this category...

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