Sotheby’s Geneva is set to auction the 100.09-carat Graff Vivid Yellow, one of the largest fancy vivid yellow diamonds in the world. Boasting a “sensational daffodil yellow” color and described as “exceptionally beautiful with extraordinary fire and brilliance," the gem is estimated to fetch $15M to $20M. Much more at our blog. http://susaneisen.thejewelerblog.com/