This is a pair of French clip earrings in an antique bronze finish and features a 1966 US stamp from the "Plant for a More Beautiful America" stamps. This was part of the “Keep America Beautiful” program spearheaded by Lady Bird Johnson, wife of President Johnson.
The images were taken from real, used, vintage postage stamp to make an asymmetrical pair of earrings and may have post office cancellation marks.
Size of earring is 18mm and they are lead and nickel free.
Earrings are water resistant but not waterproof, I recommend removing before showering, bathing or swimming.