Trifari Turquoise Blue Flower Gold Leaf Choker Necklace, 1960s

This is a vintage and somewhat hard to find Trifari choker consisting of gold finished leaves with little turquoise blue plastic flowers riverted onto it, with tiny diamond rhinestone highlights. It is about 13 inches on the main body and around 18 inches with the extension. It was used but there is little evidence of wear, and it has no damage or missing stones. It has what looks like the crown mark, but there is no crown, possibly because the impressed hook was too narrow to show it.