GENEVE, Switzerland (Reuters) — Coloured diamonds fetched high prices on Wednesday (November 16) at Sotheby’s semi-annual jewel sale, with rare and large pink and blue stones finding new owners who paid in the double-digit millions for “rare treasures”. A step-cut fancy intense pink diamond weighing 17.07 carats, set in a ring between triangular diamonds, netted $20.8 million, far exceeding its estimate of $12 to $15 million, to become the top lot. “The […]