Research outsource a sublimated coaster with lettering

Hello, I would like to find out how to recreate certain coasters. They appear to be of a certain sandstone material with gold gilt lettering with magnet disc on the bottom. I would like to know the following: * Possible reputable suppliers from Alibaba for the coasters (with the magnet) with focus only on the good suppliers. * How to apply the gold gilt custom lettering on the coaster using vinyl transfer or any other method. I am aware of sublimation but not when dealing with gold lettering. * Machines and materials used for medium-scale level (500 units per day) sublimation including start up cost + running cost (for example, heat press, cartridges, sublimation paper) I will attach the images of the product if you contact me directly. Please do not contact me if you are not serious about the project or comfortable with the current budget. This project should not take much time for people who know how to research.