Detectives have charged a further man in connection with a burglary at Beaverbrooks in Hanley.
The 28 year-old has been charged with one count of burglary, relating to the break-in, and one count of conspiracy to commit burglary at jewellers across the country.
He is due to appear before magistrates in Newcastle-under-Lyme next week - he is currently on remand, after being charged with a burglary in Stratford in September.
He is the eighth man detectives have spoken to in connection with the ongoing investigation into the break-in at Beaverbrooks in Hanley in March.
Detective Chief Inspector Ricky Fields, from the Force Safeguarding Investigation department, said: "Our inquiries so far have established that all of these individuals are connected to an organised crime group made up of Romanian nationals.
"This is a complex investigation which spans several other police force areas and further arrests are expected as our efforts continue to disrupt this group.
"I hope this latest charge sends out a strong message – Staffordshire Police will not tolerate such crime in our communities and we will take positive action against those involved."
Seven other men appeared before magistrates last month, each charged with conspiring to commit burglaries, and were remanded to appear at Stoke-on-Trent Crown Court later this month.