Antique Sturdevant & Whiting Gold-plated Stick Pin with Color Shifting Glass

This is a beautiful antique stick pin marked S&W for Sturdevant and Whiting. The pin is gold-plated and very little has worn away. The top features a color shifting piece of glass that is predominantly a mix of blue and red. There is a tiny clear glass stone and faux pearl below. When viewed under a macro lense, a series of lines can be seen in the glass. I am not sure if this is a crack or production flaw. Overall, the piece is in rather good shape. Likely made around the 1900s-10s. This pin is from my personal collection, but I have decided to let it go to a new owner. Approximate Lenth: 2.75 in.