Vintage Triangular Lapel Pin or Tie Tack

This item is a small, vintage ornamental accessory, likely a lapel pin or a tie tack, currently presented on a square white paper or cardstock backing. The pin features a distinctive isosceles triangular shape with slightly rounded corners. Its color is a deep forest green, which appears to be achieved through an enamel coating or a polished stone inlay such as jade or aventurine over a metal base. Centrally positioned on the face of the triangle is a small circular element, possibly a metal setting or a tiny inset stone, which serves as a focal point. Based on the style and construction, the item likely dates from the mid-20th century, approximately the 1950s to 1970s. The size is estimated to be approximately 1/2 to 5/8 of an inch in height. The craftsmanship suggests a mass-produced but quality-controlled accessory intended for business or formal wear. Regarding condition, while the image is slightly out of focus, the enamel or stone surface appears generally intact without large visible chips, though there is a soft patina suggest of age. No specific maker's marks are visible on the front; such hallmarks would typically be located on the reverse metal clutch or the pin stem itself. The simple geometric aesthetic is characteristic of Mid-Century Modern design.