A Roman skyphos of cameo glass can be seen at the Getty Museum.

Only about 200 fragments and 15 complete objects of early Roman cameo glass survive.

All these dates are somewhat tentative, and it is possible that smaller gem-like pieces of cameo glass continued to be produced between these periods.

It was created to look like ancient cameo glass.

Portland Vase, the best known piece of cameo glass.

In the 1850s, they began making cased glass, which has thin layers of different colors which can be cut away to produce cameo glass.

The mold-blown, double-overlay cameo glass works, 15 inches high, are to be sold separately.

Speakers at recent meetings have discussed 18th-century American glass, stained-glass art and cameo glass.

Art Nouveau is known for his cameo glass.

The cameo glass Portland Vase is said to have been excavated in the 16th century from his tomb.