The closing treatment of elevator door covers and stone walls can be carried out through the following methods:

抽缝填充：使用与石材颜色相近的填缝剂，将电梯门套与石材墙面之间的缝隙填满。先清理缝隙，确保干净无尘，然后使用填缝剂填充缝隙，将表面平整。

Joint filling: Use a joint filling agent similar in color to the stone to fill the gap between the elevator door cover and the stone wall. First clean the gaps to ensure they are clean and dust-free, and then fill the gaps with sealant to make the surface flat.

安装金属收口条：选择合适的金属收口条，将其安装在电梯门套和石材墙面交接处。金属收口条能够有效地隐藏缝隙，增加美观性，并且具有一定的保护作用。

Install metal closing strip: Select a suitable metal closing strip and install it at the intersection of the elevator door cover and the stone wall. Metal closure strips can effectively hide gaps, increase aesthetics, and have a certain protective effect.

使用密封胶：在电梯门套和石材墙面之间涂抹密封胶。密封胶能够填充缝隙并形成密封层，具有一定的防水和防尘功能。

Use sealant: Apply sealant between the elevator door cover and the stone wall. Sealant can fill gaps and form a sealing layer, with certain waterproof and dustproof functions.

在进行收口处理之前，确保表面清洁，并根据实际情况选择更适合的方法。如果不确定如何处理，建议咨询的装修师傅或咨询相关领域的人士。

Before performing the closing treatment, ensure that the surface is clean and choose the most suitable method based on the actual situation. If unsure how to handle it, it is recommended to consult a professional decorator or a professional in the relevant field.