Meghan Markle has donned a lavish £15,500 necklace as the Duchess of Sussex opens up with her husband Harry in a new interview. Sitting down to chat with American broadcaster CBS, the couple issued a warning to parents about cyberbullying in their first major joint interview since sitting down with Oprah three years ago. As the Duchess discussed her “amazing” children which she feels the need to “protect”, she stunned in an opulent necklace from Cartier with a price tag of £15,500. The ‘Juste Un Clou’ collar necklace in yellow gold features 57 diamonds, totalling 0.20 carats. Meghan paired the…