Which Audrey hepburn move prompted herto say should not wear diamonds before 40?

There is no record of Audrey Hepburn ever saying that women shouldn't wear diamonds before 40. This quote is often misattributed to her.

It's possible that the quote originated from a different source or was simply a misremembered statement.

It's important to note that Audrey Hepburn was known for her elegance and grace, and her style was timeless. She never made any public statements about age restrictions on wearing diamonds.