Thank you, Arthur, for your prompt answer to my question! I will check in the Library of Congress newspaper collection for any details about the necklaces and brooches mentioned in your post.
P.S. also delightful pictures in your post, Arthur.
--Previous Message-- : The oldest pieces in the Royal collection : could be Queen Anne and Queen Caroline's : pearl necklaces, dating back to the first : part of the 18th century: : : : : : The oldest brooch in the Royal collection : could be the set of three brooches, part of : the Duchess of Kent's Amethyst parure, which : probably dates back to the late 1810s : (Prince Edward, Duke of Kent, and father of : Queen Victoria, died in 1820, so I guess his : wife received this parure before she was a : widow). : : : : The round Cambridge emerald brooch might be : a serious contestant, though. We know that : the emeralds were acquired by Augusta, : Duchess of Cambridge at a lottery in 1818. : Unlike the other jewels made with the : Cambridge emeralds, this brooch was not made : by Queen Mary for the Delhi Durbar in 1911, : but already existed at the time of Queen : Mary's mother, the Duchess of Teck. So maybe : the brooch was made early in the 19th : century? : : : :