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Petra makes $40M from blue diamond sale

Petra's rare blue diamonds sold for US$40.4 million.

Oonagh Reidy
Petra Diamonds' Letlapa Tala collection of blue diamonds from Cullinan mine in South Africa

Petra Diamonds' Letlapa Tala collection of blue diamonds from Cullinan mine in South Africa

The sale price equates to US$470,000 per carat, according to analysts at SP Angel.    SP Angel said the high price "underlines the scarcity of the production of these gemstones".   The embattled...

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