This is a beautiful vintage sash pin in stamped silver colored metal with a large molded glass stone in transparent blue. It has an interesting organic design and the cabochon is lovely. I believe the metal is silver over brass or copper. It dates to the early part of the 20th century. It fastens with a roll over safety catch.
It measures about 2 1/2 inches by 1 3/4 inches. It is in very nice condition with no visible damage.