The Wittelsbach diamond (Der Blaue Wittelsbacher) is a 35.36 carats (7.11 g) blue diamond with size of 40 mm in diameter with 8.29 mm in depth and VS 2 in clarity. It was become part of both Austrian and Bavarian crown jewels, with color and clarity has been compared to the Hope Diamond (you can see below on No. 4).

most expensive diamond wittelsbach diamond