Naturally polished!

This rock appears to have a polished surface with a mix of light and dark colors, including shades of beige, brown, and black with some translucent qualities. This description suggests it could be a type of agate or jasper, which are both common for having such patterns and colors. Here are a couple of possibilities:

Agate: Agates often have banded or layered patterns and can be polished to a high gloss. The translucency and the mix of colors in the stone in the image are quite characteristic of agate.
Jasper: Jasper can also have similar colors but tends to be more opaque. However, some varieties like "picture jasper" can have similar patterns to agate with more inclusions.