Leibish, the New York-based colored diamond specialist, upped its bids this year by 20% to secure 16 of the 62 gems offered by Rio Tinto at the penultimate 2020 Pink Argyle Diamonds Tender. The company's biggest prize was "The Argyle Sakura Diamond," a 1.84-carat, pear-shaped fancy vivid purplish-pink stone that had been touted by the […]