A bride-to-be was robbed while out walking her dog near Preston on Monday.
The 28-year-old woman was approached by three men in Moss Lane, close to Farington Moss.
She had been walking her dog on a country track around 6.20pm on Monday (6 November).
One of the men grabbed her mobile phone, a rose gold iPhone 6S, and then spotted the victim’s engagement ring.
He threatened to stab her unless she handed it over.
One of the gang took the engagement ring from her finger and also took a stone and love Pandora ring.
The three men were all dressed in dark clothing and had their faces covered.
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They made off from the scene in the direction of Moss Side Industrial Estate.
Detective Constable Terry McKibbin said: “This a nasty, vicious robbery which has left the victim very upset and shaken.
“We want to find her attackers and are appealing to anyone with information to assist with our enquiries.
“This area is popular with dog walkers and we would ask anyone who saw anything unusual to contact us.
“Furthermore, we have released images of the rings taken. If you are offered these for sale, or have seen these items, please contact us.”
Anyone with information can contact police on (01257) 246177 or 101 quoting crime reference number SC1708590.
Alternatively, independent charity Crimestoppers can be contacted on 0800 555 111 or online at crimestoppers-uk.org