NEW DELHI: Fugitive diamantaire

, who is allegedly the prime accused in over $2 billion Punjab National Bank (PNB) fraud, is now reportedly sued by a

for selling fake diamonds.

Diamonds aren't forever:

A Canadian man is suing absconding scamster Nirav Modi for $4.2 million, alleging that the diamantaire sold him fake diamonds for $200,000 in April this year, which led to the cancellation of his engagement with his girlfriend.

Making a mark:

According to Paul Alfonso, the Canadian national, he had met Nirav Modi during the latter's visit to Los Angeles in 2012 and the duo reconnected two years later and again earlier this year, which is when he told Nirav Modi about his plan to propose his girlfriend and sought to buy an engagement ring worth $100,000.

Alfonso says he was unaware of Nirav Modi's involvement in the multibillion-dollar scam pulled off at the PNB by forging letters of credit.

Selling a con:

Alfonso ended up buying two diamond rings — one of 3.2 carats and the other of 2.5 carat — worth a total of $200,000 from Nirav Modi after his girlfriend expressed interest in another ring. But when his girlfriend took the rings to an appraiser, to get them insured, she was informed they were fake, following which she broke-up with Alfonso; he says he was in a state of deep depression in the aftermath.

Nirav Modi and his uncle Mehul Choksi of Gitanjali group are under probe by both the Central Bureau of Investigation (CBI) and Enforcement Directorate (ED) after the

was unearthed. Non-bailable warrants have been issued against them. Nirav Modi and Choksi left India before the scam was reported.