Fraudsters conned two elderly pensioners – one by pretending to be a ‘damsel in distress’.
A woman called at a home on Whiteways Road, Page Hall, in tears and told the male resident that she had been arguing with her boyfriend.
He allowed her inside, and she asked to use the toilet before leaving.
But when the man’s wife arrived home on Tuesday she discovered several items of jewellery were missing - including a gold and diamond eternity ring and a solitaire gold engagement ring.
The next day a bogus official called at the house of a 74-year-old man on Chaucer Road, Parson Cross, and claimed to be replacing TV aerials on behalf of Sheffield Council.
Once inside he claimed to also be fitting safes - a ruse that allowed him to search the kitchen cupboards.
The offender took £70 from the occupant for aerial work that was never carried out before leaving.
The first female fraudster is described as white, around 20-years-old, 5ft tall with dark, shoulder-length hair.
She spoke with a local accent and wore a patterned coat and grey-and-red carpet slippers.
Detectives are warning people in the area to be on the lookout for tricksters and also not to let cold callers into their homes as genuine workers will have made an appointment and carry identification with them.
The conman in Parson Cross is described as white, aged between 30 and 35 years, around 6ft tall and of stocky or fat build with ginger or sandy-coloured stubble. He was wearing dark-rimmed glasses, a dark beany hat, sandy-coloured jacket and dark trousers.
Call police on 101 with information about either of the incidents.