The Clark Pink A cushion-cut fancy vivid purplish pink diamond ring of 9.00 cts by Dreicer & Co., circa 1910 $1,751,000 per ct Estimate: $6,000,000-8,000,000 Price realised: $15,762,500 / £9,930,375 / €11,979,500 MOST VALUABLE PINK DIAMOND EVER SOLD IN THE UNITED STATES AT AUCTION