Micro-mosaic was an Italian jewelry sold to Victorian ladies in the early 1800 to 1850s. The images have a staggering 1,500 to 5,000 small glass bricks called tesserae per square inch. A microscope is needed to see how the glass bricks are cemented to glass, stone or a metal background then framed. As the tourism trade blossomed during this period, the Victorians purchased the micro-mosaic jewelry because the images were of the Coliseum, ancient ruins, or beautiful scenery. This jewelry was their modern-day souvenir. More in Collectors Weekly.