Golden Healer Quartz is a Master Healer Crystal.
It connects all your chakras, cleanses the chakra system, and aids in seeing and committing to the truth in every moment.
 
It also is used to enhance creative endeavours, brings mental clarity and increase powers of discernment.

Pendulums are used as a tool of divination, much like muscle testing, in order to obtain answers from your higher self.

There are many articles and videos online that describe how to use them, but here are some very basic steps:

1) Clear your pendulum (like you would any other crystal, using sage smoke, sound or other energetic cleansing techniques)
 
2) Connect with your pendulum (hold it to your heart, and blend your energy with the crystal's energy), and ask it to work with you as a divination tool

3) Ground and Centre yourself (very important, as you won't receive clear answers otherwise)

4) Determine the movements of your Yes or No answers
  
This will be slightly different for everyone. Sometimes it is a side-to-side movement, sometimes an up and down movement, and sometimes a circular movement. Pay close attention to the direction it moves (clockwise, counter clockwise).

Ask your pendulum to show you a "Yes" and wait for the movement to stabilize. Then thank it, and ask it to show you a "No" and wait. This should create a very obvious difference in movements. If it doesn't, you need to go back to step 3 and Ground and Centre yourself before trying again.

5) Clearly state your question

Once you have determined your Yes/No movements and centered and grounded, focus on your question and ask it. It must be phrased in such a way that the answer will be Yes/No.

With practice, using a pendulum can be a very useful tool for connecting with your higher self and gaining further guidance.