rosetta stone
it is the car company volvo :-)
Mini
Fiat
Volvo
The "R in a circle" mark on sterling silver jewelry signifies that it was made by the company Reed and Barton. This mark indicates the manufacturer or silversmith responsible for producing the piece.
The logo described is likely that of the band Metallica, which features a silver circle with a silver lightning bolt.
Most circle earrings are completely sterling silver or sterling silver plated with gold. But some are a base metal, which depends on company, and then plated with gold. Most generally the plated base metal earrings are costume and not very valuable.
Silver Circle - 2013 is rated/received certificates of: USA:PG-13
Opel
Tuttle Silver Company was created in 1890.
Stieff Silver Company Factory was created in 1925.
Take a slightly damp cloth, and gently rub the silver side of the disc, if that doesn't help bring it in to the company manufacturer, or bring it to gamestop.