One of the world's rarest diamonds, about the size of an egg or a large lollipop, is going up for auction next month and is expected to fetch $12 million to $30 million.

Flawless 102-carat diamond could fetch up to $30 million at auction

102-carat-diamond

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102 carat-diamond

Flawless 102-carat diamond could fetch up to $30 million at auction