This object is a 
glass salt cellar (or salt dip), which is an article of tableware used for holding and dispensing salt. 
Details
  • Material: The item is made of clear glass with a faceted, cut, or pressed design.
  • Design: It features a pattern that often incorporates diamond points and a starburst design on the bottom.
  • Usage: It is an open salt cellar, meaning it does not have a lid. Users would traditionally use a miniature spoon or a salt spoon to take salt from the dish.
  • History: Salt cellars like this one were commonly used through the first half of the 20th century before the dominance of the modern salt shaker.
  • Potential Manufacturer: Similar items were made by companies such as the Fostoria Glass Company in their "American Clear" pattern, which is known for a similar clear, pressed glass style. Other pieces exist from the depression era with various patterns.