If a colorful statement necklace gives you flashbacks to nights wearing business casual in the club, it might be time for retinol . The good news is, you can dig those oversized necklaces back out of your jewelry box—the millennial’s once-beloved statement necklace is back, and even Queen Camilla is quickly hopping on the trend. At a State Banquet during her visit to the United States, Queen Camilla wore a honking amethyst necklace pulled from the royal vaults . The design was an unusual choice, rarely seen in the last several decades since Queen Elizabeth II wasn’t a fan of the necklace. The oversized necklace was too big to be casual, but the amethyst stones are too casual to be overly formal. “Queen Camilla’s choice of the Kent Amethyst necklace is a highly deliberate one,” jewellery expert Nilesh Rakholia, Founder of Abelini , explains exclusively to Marie Claire . Queen Camilla wore an incredible amethyst necklace.…