Forgoing a formal engagement announcement may have been ok for someone unlikely to ever take the throne, but when it came to a future queen consort, all the stops were pulled out for William and Kate's big news. Kate Middleton channeled William's mother Princess Diana with her choice of color, teaming her midnight blue silk Issa dress with Tiffany diamond and cabochon sapphire necklace and matching earrings, and Episode 'Angel' pumps.