Catch them if you can

The Bohemian Crown Jewels only go on display occasionally.   The last time was in January 2018.

Bohemian Crown Jewels

I don't know when they'll be on display again, so if they do and you have a chance to see them, I'd do it.  This short article (from whence I acquired the picture) says that they usually go on display every five years, so mark your calendar for January 2023.

About that crown: "The St. Wenceslas Crown - wrought of extremely pure gold (21 -22 carat), decorated with precious stones and pearls - is the oldest item of the Crown Jewels. It weighs almost two and a half kilos and, including the cross, reaches a height of 19 cm."

From "Legends of the Bohemian Crown Jewels", we have more on the stones.  "The precious stones include 44 spinels, 30 emeralds, 19 sapphires, 20 pearls, 1 ruby, 1 rubellite and 1 aquamarine ..."

If you do get to Prague when they aren't on display, which is obviously most of the time, there is still something to see -- copies of the BCJ are available for viewing instead.