The man's trial had just entered its second day when the defendant agreed to plead guilty to lesser charges.

The 23-year-old admitted to theft and common assault after a more serious charge of aggravated robbery was dropped.

Court documents said the offender and the victim had been drinking at a Watson home after a night out.

They were joined by the offender's mother during the morning, and the trio drank alcohol and played cards.

The man's sister and her partner arrived soon after, and the offender became angry and accused the victim of disrespecting his mother when he stood to greet the pair.

The victim apologised to the woman at the offender's insistence, which she accepted.

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

The victim left briefly but returned to collect his possessions.

The offender then convinced him to talk and promised not hit him again.

But when the pair were inside the home, the offender accused the victim of thinking he was "so bling" and told him to remove a gold chain and two bracelets, worth about $14,150.

The victim then fled after he was punched in the head twice.

He returned again to get his car keys, but left without his shoes, car, keys, wallet and jewellery because he feared being attacked again.

The offender took the jewellery.

The matter will reappear for sentence next month.