Royalty, movie stars and the fabulously wealthy are good for something: jewelry. That fact was highlighted in Brilliant: Cartier in the 20th Century, which featured exquisitely beautiful things like ruby-encrusted clocks and diamond-encrusted tiaras among a raft of other luxurious bibelots made by Cartier. The remarkable show was organized under the direction of the DAM's Margaret Young-Sanchez, who relied on her lifelong love of jewelry, her familiarity with the exhibition of artifacts, and a special relationship with the Cartier Foundation. Made up of 200 objects, Brilliant was something of a visual marathon. The key revelation of the show was not that people of means love jewelry — we knew that — but rather that Cartier was often on the cutting edge of vanguard design, something Young-Sanchez underscored in her picks.