lot of vintage Chinese cloisonne enamel brass ring dish trinket dishes or tiny trays

Lot of three tiny enameled brass trays or ring dishes, made in China. I believe these are probably 1980s vintage, they show some wear and tarnishing.

Sizes are 3 1/4" - 3 1/2" in diameter, these might have been made as coasters? Glasses are so large these days, I think they'd be too small for a lot of glassware today. They'd make great trinket dishes or small ashtrays.