Here's an attractive mercury glass Christmas ornament in a ball shape.   One half features a deep indent of iridescent color shades of blue, silver/white and deep pink.  Probably from the 1950's or 1960's. 

The outer edge of this indent is a solid red color. The other side of the ball is decorated of blue and gold stripes on a silver background.  Mica flakes separates the two styles.  Cap is marked Poland.  

Size is 2-1/2" from the top of the cap to the bottom of ball or about 5-1/2" in circumference around the middle.   

Condition is used but very nice.