Bright Orange & Yellow!

This rock appears to be a type of agate or jasper, both of which are varieties of chalcedony, a form of silica. Here's a bit more detail:

Agate: Typically characterized by its banded appearance. The bands are usually of different colors or shades, and agates can come in a variety of colors including red, orange, yellow, green, blue, purple, gray, black, white, and brown. The rock in the image has a banded structure with a translucent quality, which is typical of agate.
Jasper: Known for its solid, opaque appearance and can come in many colors including red, yellow, brown, green, and blue. Jasper often has a more granular texture compared to agate. While less likely due to the translucency seen here, some jaspers can mimic the appearance of agate with banding.

Given the smooth, polished look and the translucent quality with banding, it's more likely this is an agate. Agates are often polished and used in jewelry due to their durability and attractive patterns. If you're interested in rock identification, looking at the specific gravity, hardness, and any potential fluorescence under UV light can help further narrow down the exact type.