By Erika Winters
Rio Tinto is showcasing some of the rarest fancy colored diamonds in the world at its 2012 Argyle Pink Diamonds Tender. The collection includes 56 single pink diamonds (including two red diamonds) and 19 blue diamonds.
The Argyle Diamond Mine produces over 90 percent of the world's pink diamonds and rarely, blue diamonds. The 19 blue diamond lots, titled "Once in a Blue Moon," have been collected over the past two years.
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