Vintage Murano Sommerso style faceted glass ashtray.  Burgundy tone well or center with a halo of light amber encased in clear glass.  The design is attributed to Flavio Poli, but without a mark or label I can't definitely be 100% accurate in an attribution.

Ashtray is about 6" at widest point, 3" tall.  A little weighty at just about 2.5 pounds of glass before packing.