TV stone vase w pink bisque roses brooch pin vintage ll1971

This pin or brooch is made of gold tone metal, perhaps gold plated, in the shape of a fluted flower vase filled with pink roses. The vase looks like it is made from a natural stone that is nick-named the TV stone because although it is white and opaque, you can actually read print through it. This pin is backed so I can't put this to the test. I tend to think this is glass, something like pate de verre.

The vase has golden handles and contains four roses made of pink bisque ceramic. These are very finely done. The back of the pin is finished in an engraved scrolly design. The pin is 2 inches long. It has no designer marks which surprises me as this is a very high quality piece of costume jewelry. The catch is very secure.