The House of Blue Diamonds. One of the most important blue diamonds to come to market in recent years, the Mediterranean Blue clocks it at No. 7 on the #SothebysWrapped🎁 countdown and led the demand for this saturated hue this year. The rare Fancy Vivid Blue diamond weighing 10.03 carats sold for CHF 17.9 million/ US $21.5 million during our Geneva High Jewelry auction in June. Swipe to watch the first minute of bidding.