Earrings are cut and sanded, for smoothness, from the 3 tins in the images. A brass rivet holds them together.
Ear wires are gunmetal-plated brass, 15mm fishhook with open loop, 21 gauge.  Each pair come with silicone clear earring backs. 
Earrings have been treated with a museum grade wax to protect and enhance, called Renaissance.
Some of the tins are vintage and have been lovingly used over decades. Therefore, there may be fine scratches or imperfections.