Amethyst or Moonstone?

My dilemma... which gemstone should I have on my Pendulum?

I'm a Gemini, so I originally thought Moonstone would be the right stone. It is a birthstone for the Gemini sign and is beautiful in it's own right, but it just doesn't feel right, not what I would usually go for.

As for Amethyst, it's mysterious, dark and beautiful and feels like it has a secret to tell, much more my style, but not a Gemini Birthstone.

I've held both Pendulums, asked both questions and thought long and hard, but still I cannot decide.

I think I will settle on Amethyst. Mysterious is appealing and the purple stone feels right.