Police are hunting two men after a violent robbery that left a woman unconscious in a Notting Hill street.
The woman was attacked in broad daylight in Colville Mews, where one of the men grabbed her round the throat and lifted her off the ground.
His accomplice then snatched a rinf from her finger, before the men ran from the scene, leaving her slumped on the ground.
The men were seen getting into a red Nissan Qashqai before driving away.
The incident happened at about 3.30pm on Wednesday, February 17, and police are now looking into whether it was linked to similar incidents that have taken place in west London.
The suspects have both been described as black men, who were wearing dark coloured clothing.
One was wearing a dark hooded gilet, a black baseball cap, dark coloured trousers, trainers and gloves, and was carrying a black satchel.
The second man was wearing a dark hooded up top, a black woollen hat, tracksuit trousers, trainers and gloves.
Detective Constable Chris Anderson, from the Westminster Crime Squad, said: "This was a violent attack on a lone woman in broad daylight. These men left a woman lying on the ground; and all for sake of a £250 ring.
"It is important that they are caught before they hurt anyone else. I would appeal to anyone who recognises either suspect to contact police. I would urge anyone who was in the area at the time and saw the red Nissan to speak with us. Where did they go after they left Lonsdale Road?
"At this stage, we are investigating whether this robbery is linked to similar offences that have taken place in Westminster and Kensington & Chelsea. Any piece of information, however small, may help us to catch them."
Detectives would also like to hear from anyone who was offered a ring for sale in the days after the robbery.
It is described as a silver band with a clear stone, which the suspects may have mistaken for a diamond.
Anyone with information is asked to contact police via 101 or call Crimestoppers anonymously on 0800 555 111.
