Vintage Murano art glass vase.  Likely part of the 'I Sommersi' series, featuring green and pink swirling patterns. 
 
The "I Sommersi" series refers to a collection of vintage Murano glass art objects, primarily from the 1950s to the 1970s, known for their unique designs and layered, "sunken" glass technique.
 
These handcrafted pieces feature distinct colour gradients with some items attributed to artists like Luigi Mandruzzato and Flavio Poli. The term "Sommersi" (Italian for "sunken" or "submerged") refers to the technique of embedding one colour of glass within another, creating depth and a unique visual effect.