The murder trial of lubricant businessman John William Chardon, 71, heard a witness tell of seeing an attractive Asian woman in a bikini adjacent to the Gold Coast beach four days after she last talked to friends.

The 34-year-old's body has never been found but she hasn't left the country, seen a doctor or used her bank accounts since.

Council worker Mark Lester Clayton says he was looking for shade when he encountered the woman who was sharing wine and cheese with a tall, slim, Caucasian man aged in his 40s under a tree.

"He introduced her as Novy," Mr Clayton told the Supreme Court jury of a brief conversation he had with the pair, adding that he had never heard the name before.

He remembers the man saying "Novy" was from France, and at one point the man "mouthed to her he loved her or something like that."

To the best of his memory, Mr Clayton says he saw that woman on February 10, 2013.

She was "absolutely identical" to Novy Chardon, whose picture he saw on a television news report less than two hours after leaving the beach, he said.

The testimony came after Ms Chardon's then neighbour Glenn Ronald Liscombe said Ms Chardon had feared her husband two years before she was last seen on February 6, 2013.

"She said that if she didn't come back from an overseas trip, that John had probably killed her or organised for her to be killed and for me to go to the police if she didn't come back, if I didn't see her," he told the court.

She didn't raise that concern with him again after her return.

Last week, the court heard there had been allegations of infidelity on both sides of the relationship.

The trial continues.

Australian Associated Press