The piece is made by the Plainville Stock Co of Plainville Mass.. The company was in business from around 1896 – 1980’s
Era: c.1930’s
Hallmarks: 10K P.S. COL
Composition: 10K Yellow Gold
Primary Stone: Black Onyx
Ring Face: 19.1mm x 11.15mm
Rise Above Finger: 3.86mm
Ring Size: 5.5
Ring Weight: 2.3 grams
Ring Condition: Excellent estate condition, ready to wear