Such an interesting topic you have chosen Dave.

I was hoping that some of our posters who know more about the Dutch jewels would see your post. I know there is information available, but I won't have time to do any searching until late tomorrow or Wednesday. In the mean time, the answer may be on the Dutch Royal Jewels site on Instagram. https://www.instagram.com/dutchroyaljewels/?hl=en I have just looked at the site quickly and found this entry https://www.instagram.com/p/BaHJytdABjC/?hl=en&taken-by=dutchroyaljewels