Organised Crime Squad Detective First Class Constable Geoff Bull said it was believed the jewellery had been stolen from homes across the metropolitan area.
Constable Bull said many of the pieces looked like heirlooms that would have sentimental value to their owners.
“Officers from the Organised Crime Squad executed a Misuse of Drugs Act search warrant at an address in Canning Vale on December 2 and located a number of items of interest, along with over 150 items of jewellery with an estimated value of $100,000,” he said.
“Many are thought to be of huge sentimental value and police are keen to get them back to their owners as a result.”
Const Bull said inquires were ongoing.
“With this particular search warrant, we were hoping to seize a quantity of drugs or obtain further lines of inquiry,” he said.
“Further search warrants were conducted elsewhere which related to this one and resulted in the seizing of drugs and firearms.
“To date, a number of arrests have been made and inquiries are continuing with other persons of interest.”
Information about the jewellery can be reported by calling 9223 3903 and quoting report number 021215 2215 10091.