On July 31, 2018, robbers stole two crowns worn by King Charles IX and his wife Queen Christina from a Swedish cathedral.
Swedish police were said to be chasing them by boat, helicopter and in cars.
"I saw a little, white boat and the men jumped in the boat and sped away", a witness told the Swedish daily Aftonbladet. The monarchs were initially buried with these crowns, but later exhumed, NBC News said.
The thieves snatched two gold crowns and an orb made for King Karl IX and Queen Kristina in the daring robbery.
"These are items that are completely unique, well-known.in Sweden and probably even internationally", he said.
Police say the burgled regalia are "invaluable objects of national interest" and can not be given a price tag.
Thieves flee on motorboat after stealing Swedish crown jewels
'We are looking for a small and open motorboat. We have some different information about how exactly the boat looked.
"I knew immediately they were burglars because of the way they were behaving". But all those displays, in addition to catching the eyes of thousands of visitors, seem to also have caught the attention of a number of thieves.
"It's 1-0 to them right now", police spokesperson Thomas Agnevik said.
Maria Ellior, an official with the Swedish police's National Operations Department, told the local TT news agency Wednesday that the items would be "impossible to sell".
Thieves in Sweden stole two priceless crowns and a royal orb from under an alarmed, locked case in a cathedral in Sweden and made what so far appears to be a clean getaway.
"It's despicable that people would steal from a holy building and a historical building", said Rowell.More news: MDC Alliance claims Chamisa to win by 65pc