Depending on how big you want to be, such as maintenance, the big problem is generally returning to the factory, and the local maintenance is generally just ring expansion, gold filling and electroplating. Do you think it is necessary to do your own maintenance, and hire a maintenance master? If your business is not big, just have a safe, there is no need to have a vault. Toilets are a must. You also need to install cameras, lights, and exquisite decorations. Some tools necessary for sales staff, 4C comparison cards, lubricating oil, gloves, foot pads, mirrors and so on.