A charity has offered a reward of up to £1,000 to anyone who can help police nail criminals behind a wave of jewellery snatches.
Crimestoppers hopes the reward will convince associates of the robbers – many of whom carry out the thefts while riding bikes – to break their silence.
Most of the offences have taken place in the Belgrave area of the city. Last month there were 16 incidents, compared to 10 in the same month last year.
Across the city and county, including the Belgrave crimes, there were 21 incidents in August, up on the total of 15 from a year ago.
Kiran Dhanda, East Midlands regional manager for Crimestoppers, said: "These gold snatches are very upsetting for the victims who are losing gold jewellery that has great sentimental value to them.
"Stand up for your community and don't let the perpetrators get away with this.
"Do the right thing by contacting Crimestoppers anonymously.
"I can guarantee that nobody will know you contacted us.
"You will not have to give a statement to the police or go to court – we have never broken our anonymity guarantee."
A Belgrave woman whose gold chain was snatched from her neck by a young rider a year ago has urged people to be cautious.
She said: "I don't wear gold chains during the summer months now because I don't want it to happen to me again.
"When I do wear them at other times of year, I make sure they are covered up while I am outside.
"When my chain was stolen it was all over in a couple of seconds – by the time I realised what had happened, he'd gone."
Last month, police urged victims to dial 999 as soon as possible in the aftermath of an attack. Officers fear they are losing vital time because some victims are waiting hours, or even days, before reporting the crime.
Officers from Keyham Lane police station are patrolling the area throughout the day and are ready to respond to emergency calls.
The police commander for the area said prompt calls from victims or witnesses would give her officers a better chance of catching the culprits.
Inspector Lucy Batchelor, commander of Keyham police station, said her officers were raising awareness of the dangers of chain snatches and advising people to take a number of basic safety precautions.
Insp Batchelor said: "It is extremely important that people take extra precautions when wearing precious gold jewellery out in public. Not having your jewellery on show will reduce the risk of you being targeted.
"We urge anyone who is a victim of this crime to call the police immediately and equally that any witnesses do the same to give the police the best opportunity of catching the offenders.
"Even though we have increased patrols in the area, we need that quick call from the public to give us the best possible chance of catching those responsible.
"We are currently working closely with the community to raise awareness of this crime."
Police have run a series of crime prevention campaigns to warn people of the dangers of snatch thefts. General advice includes the following: Be discreet when wearing jewellery in public, perhaps by wearing a scarf or other clothing to cover it. Be aware of your surroundings and what is happening around you. Photograph your jewellery and register it for free on the national Immobilise website, which helps police return recovered stolen property to its owners.www.immobilise.com Contact Crimestoppers on 0800 555 111 or through our anonymous online form at www.crimestoppers-uk.org.