Central London county court is hearing a case brought by Ms Ruzica West against Professor Mateja Marinkovic over the sale of an 18th century violin.
Ms West claims that in 2016 she sold her teacher the Landolfi violin, a family heirloom, for what she believed to be £40,000 – the sum of £26,000 in cash, plus a violin worth, she was told, £14,000.
She claims the substitute violin was worth just £1,500.
Mateja Marinkovic, a former professor at the Royal Academy of Music, is said to be presently teaching in China. He is still listed as RAM staff.
He was not in court. The case has been adjourned for trial in the summer.