Almost nine months after a Queen Street jewellery store was robbed, police are still looking for a rare diamond ring.

In early January, 42-year-old David Compagnoni went to the store with Marco Cipollone, 34, and arranged with the business owner to buy a five-carat diamond engagement ring for $200,000 and a pair of diamond earrings for $7,000.

They had allegedly planned to defraud the broker using fake bank drafts, but changed their minds when the man told them he would have to verify the currency.

On January 9, instead of picking up the jewellery, police say Compagnoni and 34-year-old Andrew Gordon showed up at the business, forced the owner to the ground at gunpoint and duct-taped his mouth, hands and feet. They also allegedly bound another business owner who tried to help the victim.

The two then allegedly took the ring and about $600,000 worth of other jewellery, including loose diamonds.

The Toronto police Hold-Up Squad raided several addresses over the next two weeks and arrested Compagnoni, Cipollone, Gordon and a fourth man, 35-year-old Antonio Bandiera, who is accused of setting up the fake bank drafts. The four were charged with several offences including conspiracy, armed robbery and forcible confinement and are still awaiting a court date.

Some of the jewellery has been recovered, but not the ring.

Anyone with information about the missing jewellery is asked to call police at 416-808-6350 or Crime Stoppers anonymously at 416-222-8477.