A man was arrested last night in connection with an armed robbery with took place at RHS Jewellers, Prospect Hill, Douglas, at around 4pm on Friday.
Police say he has been detained at police headquarters and enquiries continue.
Detective Sergeant Brian Shimmin said: ‘Many thanks to the public who have assisted us with this matter so far, but the appeal for witnesses and information remains relevant.
‘I still would really appreciate contact from anyone who can help.’
The storeholder at RHS Jewellers was left badly shaken after he was threatened with a claw hammer by a man wearing a motorcycle helmet.
The raider used the weapon to smash a display cabinet and grab items of jewellery with a retail value of about £25,000.
He then fled on a Gas Gas motorbike stolen before the robbery from Road and Track Motorcycles on Tynwald Street.
The bike was later recovered at the end of a service lane running behind Belmont Terrace.
On the other side of the railings in a rough thicket leading down to the track known locally as the Cinder Path, officers recovered the helmet and the hammer which had both been burned.
Anyone with information about the robbery can contact DS Richards at police headquarters on 631212 or you can call Crimestoppers anonymously on 0800 555 111.