Flash Gold is similar to gold coating; the difference being flash gold has a thinner layer of gold than the average gold plating and making it more cost-effective.
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.