as the tittle says, what i was in the beach getting some corals and coal(sometimes there's coal there) and i o check my backpack and there's a gold quality coal there
i got the same thing while on the beach its only worth about 30 gold i think and i dont think its used for any special purpose
its becouse the coal on the beach is linked to your foraging skill (wich also detemions the quality) the coal in the mines is a drop so it never has a star
I feel somehow less worthy, mine is "only" silver quality. I won't sell it for now as it is a novelty (or shall I use it for that festival where you have to show off your best stuff )
The fair in fall. I had a really awesome bit of coal on my display, well it was made of similar stuff but more shiny and such (diamond). Generally speaking coal quality doesn't mean much just like quartz quality unless you are selling them but seems better to just use them since it isn't decent money anyway.