Gems, as the name implies, are embedded in equipment, including red, yellow, blue, green and colorful sockets. The socket can be plugged in at will, but there are corresponding socket reward attributes below. Generally, plugging in a red socket is smart, agile, powerful and has greatly improved its attributes. Below is the gem color of the corresponding socket.

Red groove. Red. Orange. Purple.

Yellow groove. Yellow. Orange. Green.

Blue grass. Blue. Purple. Green.

I hope it works for you!