Do you have to use a macro lens for still life photography such as jewelry? Is it ok to set the focus with 50mm?

I don't think so. The nearest focal length of 50mm is 0.45 mm. At this distance, jewelry is too small to reflect its characteristics.

Do a good job of buying macro, but there is also a compromise, that is, buying telephoto can still highlight jewelry, or it can be blurred by the more beautiful Jiao Wai.