Adjectives to Describe a Coin:
Material:
* Gold, silver, copper, bronze, nickel, platinum, aluminum, brass, steel
* Shiny, metallic, gleaming, lustrous, tarnished, dull
Appearance:
* Round, circular, oval, square, rectangular, irregular
* Smooth, textured, embossed, engraved, carved, worn, scratched
* Heavy, light, thick, thin, small, large, miniature, antique
Condition:
* New, old, ancient, antique, vintage, rare, common, valuable, worthless
* Clean, dirty, dusty, corroded, oxidized, polished, pristine, damaged, worn
Other:
* Lucky, precious, valuable, collectible, historical, symbolic, commemorative
* Foreign, domestic, local, national, royal, imperial
* Heavy, weighty, hefty, light, flimsy, weighty, substantial
Figurative:
* Shining, glittering, gleaming, shimmering, sparkling
* Cold, hard, unforgiving, impersonal, blunt
* Lucky, charmed, prosperous, fortunate
Examples:
* A shiny new copper coin
* A tarnished silver coin
* A heavy gold coin
* A rare ancient coin
* A lucky silver dollar
* A valuable collectible coin
The best adjectives to use will depend on the specific context and the story you are trying to tell.