Most of the iron pyrite (aka fool's gold) we see in antique jewelry is left with its rough, crystalline surface intact. That's how it mimics real gold - even though the color is off, with its green, silvery hue - and it's unique-looking. Why did the jeweler here cut and polish it flat, even though pits and irregularities remain? I would ask him if I could.
MATERIALS: 14k gold (tests), iron pyrite, glass lens, new 14k gold chain
AGE: c. 1880
CONDITION: Excellent
SIZE: 1 1/2" length including the bail, 1" width