Brushed is a process of using quartz sand to polish a chosen metal (gold, stainless steel, etc.) under high pressure. This finish is an effective method for removing surface imperfections. In addition, it gives a pattern of fine lines parallel to the brushing direction that creates a distinctive look for jewelry.
Epoxy is a tough and resistant thermosetting synthetic resin that contains epoxy groups. It is strongly resistant to corrosive chemical heat, and ultraviolet light, and is widely used as surface coatings, laminates, and adhesives.