I don’t understand the photo.
The article describes one small plate, then a coin, then a plaque.
Something lost in translation, I think.
The photo looks like 4 normal size plates, and mostly the edges, so we can’t even tell if they are decorated.
IKEA stock photo?
They look like cymbals.
Cymbals of what I can’t really say.
I think they just needed something, and used that.