An Adelaide jeweller has been accused of preying on the vulnerable by offering to buy valuables, including gold teeth, at gambling venues where punters play the pokies.

Hallmark Jewellers released an advertisement for its events at various pokie venues across the city where it seeks to buy “on the spot” gold jewellery, watches gold nuggets, gold coins and even gold teeth.

It held one event in January at the Village Tavern at suburban Golden Grove, which was investigated by liquor and gambling authorities.

Opposition Leader Peter Malinauskas said the “reprehensible” and “predatory behaviour” was taking advantage of those in an already vulnerable situation.

“The practice is clearly about preying on vulnerable people and must be outlawed,” he said.

“For problem gamblers, this makes it even easier for them to pawn their valuables for instant cash.”

But Attorney-General Vickie Chapman said the investigation into the Village Tavern event found it was held in a private room and not near the gaming area.

“The Village Tavern does not appear to be in breach of its obligations under the codes of practice,” Ms Chapman said in response to opposition concerns.

Hallmark and the tavern have been contacted for comment.

It was believed Hallmark intended to run similar events at other venues this week, but details were taken down from its Facebook page.

Mr Malinauskas said the opposition had drafted legislation to ban the sale of second-hand goods at licensed gaming venues.

It will introduce the private member’s bill, which includes fines of up to $35,000 for venues, to parliament next week.