Titanium is a coating on the crystal that enhances the energy of the crystal. Bonding titanium to the crystal changes the healing properties of the crystals by increasing the vibration to a higher one. The rainbow colours mean it resonates on all the chakras and can be used to align and balance the 7 chakras. Also used to increase the vibration of the aura to a higher one without getting ungrounded. This may work uniquely on different people depending on what you are trying to manifest.
Lava Rock has earthly energy and absorbs negativity from the aura very effectively. With the titanium, these powers will get enhanced.