Helen Mirren Dazzles at Cannes Film Festival Wearing Massive Necklace with Gemstones Totaling Over 400 Carats Helen Mirren just delivered one of the most memorable jewelry moments at the 2025 Cannes Film Festival — if not of all time. On May 22, the Oscar winner, 79, attended the Colors of Time premiere wearing a jaw-dropping Margot McKinney necklace called the …