Grays, an antiques center with the most fabulous jewelry in London, hands down, is by reputation as expensive as it is elegant. But it turns out that even the glittering Grays is not beyond the modest means of thrifty antiquers. Head downstairs, where Jo Elton and Olly Gerrish sell paste serpents and enamel butterflies. On the main floor, Sylvie Spectrum specializes in late-19th-century brooches that say darling or baby or sweetheart.
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