My last stop was at the Marisa Perry Atelier in Soho. There were traditional settings, a few modern ones, and two newly debuted Art Deco–style collections. The prettiest was the Larisa— a round-cut diamond on an antique-looking micro-pavé setting. Its mounting was made so you can slide your wedding band right under the ring without having to get one that dips down and around the base of the stone. Plus, an optical illusion occurs when you look at the Larisa—the center stone appears a lot larger than its actual carat weight, good for brides who think that size matters—which, let's face it, it kind of does. 154 Prince St., nr. W. Broadway; 212-566-8977.