Pendulums are used to ask questions of the universe. And while pendulums can be any weight on a string, they tend to develop their own personalities and there are days one will work for you happily and days that that same one will decide to "take the day off" - so people who use pendulums often collect many of them and alternate depending on the day. They are like tools with the personalities of pets so to speak and developing a relationship with one is quite personal.
We are honored that you are considering allowing us to choose your pendulum for you. Like you, we believe the universe is intelligent and that if you are choosing to trust us you will get exactly the pendulum you are supposed to get.
Yellow Aventurine is useful to inspire compassion within us. As an ally we can work with her to relieve overwhelming grief.