The 27.54ct sapphire from Kashmir in this ring belonging to Greek financier Dimitri Mavrommatis combines a deep velvety blue colour with a very high purity. It will go on sale at Sotheby's Geneva this November (estimate: US$3-6 million).

The 27.54ct sapphire from Kashmir in this ring belonging to Greek financier Dimitri Mavrommatis combines a deep velvety blue colour with a very high purity. It will go on sale at Sotheby's Geneva this November (estimate: US$3-6 million).