An Italian Grand Tour Porphyry and Sienna Marble Paperweight, late 19th Elegant Paperweight in Bronze and Nero Portoro marble. Late 19th An Italian Grand Tour Specimen Marble Paperweight, Late 19th Century Elegant Paperweight in Bronze and Nero Portoro marble. Late 19th. Nero Marquina paperweight with large centered micro mosaic of the Roman Colosseum. Grand Tour, Italy, 19th C. Style Number: B24A0096 Measurements 4. 37" long 0. 75" tall 3. 25" wide