The piece measures 1.75" long x 1" wide. It likely originates from a piece of a fine china dish or tableware. The simple blue floral design spans across most of the front of the piece, the back and edges are purely white. Dime in photo for size reference.
This piece of genuine sea pottery will come with a display card that describes the short story of sea glass (which includes pottery as well) and the name of the ocean from where it was found.