You can read more about the crystal here >> Aqua aura

Aqua aura activates the chakras, especially the throat chakra. It improves communication and helps us to overcome the fear of public speaking. It encourages self-expression so that we can express our thoughts on what interests us and what we want. It helps us see more clearly. It opens the blockages and thus allows a new flow of energy and a new beginning. It also increases the potency of other crystals. Because it has balanced energy, it does not need to be cleaned. 

We know several color variations that are created by adding different precious metals to clear quartz. The blue color is created by adding gold, and the rainbow color (opal aura) is created by adding platinum to clear quartz.