Victorian antique filigree silver and pinchbeck ring set with sapphire and rhinestones, size: 8

Victorian antique filigree silver and pinchbeck ring set with sapphire and rhinestones, size: 8, adjustable
Size to top: 2.1 x 1.4 cm.
Silver part tested by acid.
Pinchbeck is a form of brass, an alloy of copper and zinc, mixed in proportions so that it closely resembles gold in appearance. It was invented in the early 18th century by Christopher Pinchbeck, a London clock and watchmaker.