Trans GID Click Clack or Clack Factory Keycap.

In good condition, besides some bubbles on the bottom from when it was made. It is possible it is a one-off, or a prototype make.

All the photos are indeed of the single keycap itself, and it looks white or can have a greenish hue depending on the lights.

For it to glow as in the picture, LED light was shined on it for 20 seconds.

THANK YOU! :)