Detectives have released images of three paintings and a diamond ring in the hope of reuniting them with owners.
Police believe they were stolen from a home or vehicle in the south-west London area.
They were recovered after a 37-year-old man was stopped and searched in Battersea on October 15, Scotland Yard said.
He was later released under investigation.
The paintings are signed and dated by a London-based artist who died a number of years ago.
The ring, a platinum band, is believed to be set with diamonds.
There is also a name on the back of one of the paintings which the team hope will help corroborate any claims to ownership.
Trainee Detective Constable Ben White, investigating, said: “These items are distinctive and we really want to reunite them with their rightful owners.
“They are clearly portraits of loved ones commissioned by a family, and if you know who they belong to, please contact us without delay – we are keeping them safe.”
Anyone with information is asked to contact police on 101, quoting CAD582/15Oct.
