This is a vintage, mid 20th century, about 1950 - 1960, hand blown glass bowl that was made in Murano, Italy. It is Mid Century Modern style and done in what is referred to as aventurine (gold) and puleguso (the flecked areas). This can be attributed to Venini, Seguso or Barbini, all of whom worked in this glass style. It is similar to designs also by Flavio Poli and Carlo Sarpa. There are a fair amount of bowls similar to yours by all of these makers in the same color scheme and amoeba form with polished pontil. These were intended to be ashtrays. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.