Crown Trifari set

I have the following 3 items, which I believe fall into the Crown Trifari category. They are a bracelet, earrings and a necklace. All have the Trifari marking with a small crown above the T. In addition, there is a "C" in a circle to the right. All the items were found in a box with, "The J.L. Hudson Company Detroit". One of the red stones is lose. (It fell out of its setting when I removed it from the box).

I would be most interested if there is any value to these items. Any other information would also be useful Thank you

Rosanne