Posted by Henri M on September 30, 2012, 2:36 pm, in reply to "Amethyst earrings?"
It must Constance Else Gualthérie van Weezel, sister to the Duchess of Parma.
She is married to Michiel Mensink. If it is the correct Michiel Mensink I googled, then he has the same age as Prince Friso, studied at Delft University (like Prince Friso), has worked for McKinsey (like Prince Friso) and studied at the INSEAD in Fontainebleau (like Prince Friso and Prince Constantijn), as co-founded a few companies (like Prince Friso).
At the moment Michiel Mensink is co-founder and CTO of i-Optics, a very innovative and high tech company in complicated eye solutions. His company makes advanced microscopic, electronic and laser equipment for corneal transplants, refractive and cateract surgeries.
The Duchess has a brother too: Lodewijk Gualthérie van Weezel.