Unique 18th- and 19th-century tourist treasures, many with a twist, are currently on display in the exhibition “A Return to the Grand Tour: Micromosaic Jewels From the Collection of Elizabeth Locke,” at the Gibbes Museum of Art in Charleston, South Carolina.  Made from teeny-tiny pieces of colored glass, micromosaics make up the most amazing, almost painterly pictures depicting all manner of things. The exhibition’s micromosaics include quintessential scenes of Rome: the people, landscapes, and, of course, famous architecture such as the Colosseum, St. Peter’s Square, and the Roman Forum.   Some of the best micromosaics contain an astounding 3,000 to 5,000 tiles per square inch. The exhibition’s micromosaics contain up to 1,400 tiles per square inch.  A Jeweler’s Love for Micromosaics Locke, a contemporary jewelry designer, first fell in love with micromosaics while living in Florence, Italy. In 1989, she bought her first micromosaic: a small rectangle of the Temple of Vesta. …