https://arkeonews.net/unique-gems-found-in-claterna-known-as-the-pompeii-of-the-north/
Nice
The other place you'd find 50 gems would be a bathhouse. It is unclear what detail they have of the site. It mentions it is an unstratified site. That would usually mean churned up. I suspect, though, we are seeing a mistranslated Italian technical term. The photos suggest good preservation.
The article uses the term "non-stratified" site. Rather than implying churned up, as in no distinct stratification layers, it could also signify that no formal, stratification (in a statistical sampling sense) of experimental plots has been laid out over the research area.