Question: what are the strongest crystals?
Answer: Clear Quartz. Clear quartz, also called rock crystal, is known as a master healer and a stone of great power. ...  Ruby. The ruby is said to be the most powerful gem in the universe because of its high energy. ...  Amethyst. Amethyst is a very powerful stone for master healers and meditators. ...  Malachite. ...  Aventurine. ...  Citrine. ...  Kunzite.