Justice John Burns sentenced the man to two years and four months' jail, backdated to take into account time spent in custody, with a non-parole period of 19 months.

The sentence means the 24-year-old would have become eligible for parole in February if he were not in custody awaiting trial on a number of serious, but unrelated offences.

The man had originally pleaded not guilty to a charge of aggravated robbery, but he made a dramatic mid-trial plea of guilty to lesser charges of theft and common assault in February.

Court documents said the offender, his mother, and the victim had been drinking and playing cards at a Watson home in October 2011.

The offender accused the victim of ''disrespecting'' his mother, forcing the victim to apologise, which the woman accepted.

But the offender then yelled at the victim and punched him in the face.

The victim left briefly, but was convinced by the offender to stay after he returned to collect his possessions.

The offender then accused the victim of thinking he was ''so bling'' and told him to take off a gold chain and two bracelets, worth about $14,150.

The offender then punched the man in the head twice and the victim fled.

The victim again returned to collect his belongings but left without his shoes, car, keys, wallet and jewellery because he feared being attacked again. The offender took the jewellery.

The court on Tuesday heard the offender had refused to co-operate with police who tried to recover the jewellery.

A pre-sentence report said the man had been binge drinking since he turned 17 and began to use ''ice'' at 19.

He had misbehaved in custody and posed a high risk of reoffending on release, the court heard.

But Justice Burns gave the man a 20 per cent reduction in sentence for the guilty plea.