Mona Lisa

The Murano glass, blown, art disc is approximately 50mm x 19mm thick, with the image of the artwork "Mona Lisa", by Leonardo da Vinci*, on the front. 

The necklace is Alessandro's own, custom design, using hand made, Murano glass / Venetian Glass Beads: 

the large center, blown Murano glass 50mm disc, 

six round, 10mm "exposed gold", periwinkle blue / amethyst/ and 24 karat gold foil.  (Note:  amethyst Murano glass over gold foil appears to be bronze color.)

Necklace is accented with small, gold, tubular seed beads; gold spacer rhondelles; gold Italian bead caps; and gold filled, lobster spring clasp. 

Length of necklace is approximately 19 Inches, or 48.26 cm.

*From Britannica:

Mona Lisa, also called Portrait of Lisa Gherardini, wife of Francesco del Giocondo, Italian La Gioconda, or French La Joconde, oil painting on a poplar wood panel by Leonardo da Vinci, probably the world’s most famous painting. It was painted sometime between 1503 and 1519, when Leonardo was living in Florence, and it now hangs in the Louvre Museum, Paris, where it remained an object of pilgrimage in the 21st century. The sitter’s mysterious smile and her unproven identity have made the painting a source of ongoing investigation and fascination.