The jewellery, including a number of valuable rings, was taken from a house in Kings Road on Friday 21 March.
Images of some of the stolen rings have been released by officers in an effort to try and trace them.
The thief, or thieves, sneaked into the house and stole the items from a bedroom, as the owner was moving her car, sometime between 5.55pm and 6.05pm.
DC Wendy Sewell, from Birmingham North CID, said: “The woman is distraught that her jewellery was taken; she was only out the house for a very short time moving her car.
“The total value of the jewellery taken is believed to be around £30,000 and we are appealing for anyone who may have seen the theft, or anyone who knows where the jewellery is, to contact us.”
Anyone who can assist police should call 101 or the independent charity Crimestoppers anonymously on 0800 555 111.