Definitions

1. adjective

covered or stained with dust or dirt, especially on the surface of a hard, dark-colored mineral such as rubies or garnets, or having a reddish-brown color.

“The ruby’s rubby surface made it almost unrecognizable.”

2. verb

to become or make something rubby, especially to make a gemstone or mineral surface appear dull or discolored.

“The careless handling of the gemstone started to rubby its surface.”