On Saturday, April 6, officers from the Chichester neighbourhood policing team executed a search warrant at Ebony Jewellers, in South Street, Chichester, looking for suspected stolen property.
Most of the stock of the shop was seized during a two day period, and is still being examined in order to establish where it has come from.
No arrests have been made at this stage.
There are more than 1,000 items, with an estimated potential total value of between a £250,000 and £500,000.
As part of the investigation police have now set up a special website, here with photos of all the valuables seized.
Sergeant Jason Vickers said; “We like to re-unite owners with their property wherever possible and are inviting anyone who has been burgled in central and West Sussex, East Hampshire or south west Surrey in the past 12 months to log on and have a look.
He added: “If you think some of it may belong to you, please call us at Sussex Police via 101 quoting Operation Emerald or serial 0439 of 8/4.”