Some marbles are made of softer glass than others. When they came out of the furnace, they dropped onto rollers and usually survived quite nicely. Iโm not big on restoration of marbles unless theyโre high dollar marbles and even then , I am concerned they will be eventually sold as mint to an unsuspecting buyer. Veneered marbles are less likely to be restored well due to their thin coating. Remember, no question is dumb unless you know the answer!