Graffさんのインスタグラム写真 - (GraffInstagram)「The Wittelsbach-Graff diamond weighs a breathtaking 31.06 carats – unheard of for a stone of this hue. When the diamond was acquired in 2009, Graff decided to re-polish it, repairing its surface and improving its colour, making it the largest natural Fancy Deep Blue Internally Flawless diamond ever discovered. #GraffDiamonds」7月4日 21時51分