Locket ScienceHeather Moore knows all about sentimental message jewels—not to mention bridal designs, thanks to the debut of a collection last summer. Her recent offering, the Locket ring, combines both beautifully in an unexpected way: a gold band with a cavity containing either an inscribable metal insert or a tiny paper scroll ideal for handwritten messages.The concept actually came from Moore’s grandfather, a World War II spy and code cracker in an organization that was the precursor to the CIA; he used to write tiny romantic notes to his wife and hide them all over their house in a playful lover’s treasure hunt game. (His career cover, reveals Moore, was a post in the jewelry export business.)“I love the sentiment of these,” says Moore. “And there are lots of opportunities within the Locket ring idea.”The idea came to her just a month before the ­Centurion Jewelry sho