At Doyle & Doyle on the Lower East Side, I was shown two dozen or so engagement rings, all of them antique. The prices were a lot more reasonable than what I had seen all day, especially uptown, but they didn’t appear to be any less high-end. I settled on something more off-center than the usual diamond solitaire: an emerald-cut sapphire ring with diamonds on either side (1.28 carats). It had a retro fashion feel, without being at all matronly. And though the stone broke with convention, it was still very classic and, more important, it suited me quite well. 189 Orchard St., nr. Stanton St. 212-677-9991.