A 78-year-old woman had her necklace snatched by a robber on a bicycle as she walked along a city street.
The victim was walking along London Road in Alvaston at about 2.40pm on Monday, July 21 when the robbery took place.
The offender cycled up from behind the victim as she passed the Food 4U shop and grabbed her necklace.
He pulled the necklace off before cycling away with it. The victim was not injured but was left shaken by the incident.
The offender was white, aged 16 or 17 and of slim build. He wore a light coloured baseball cap, fading denim jeans and a light long sleeved top.
Witnesses or anyone with information on the robbery should call Derbyshire police on 101, quoting incident 405 of July 21.
You can also call Crimestoppers, anonymously, on 0800 555 111.