Tourmaline rings are matched with 18k gold, and platinum rings are the best. 18k gold and platinum, which are relatively hard, are suitable for setting tourmaline mixed jewelry. The hardness of tourmaline is 7-8, which is relatively high, but tourmaline itself is brittle and afraid of breaking. Tourmaline, also known as wishing stone, has a weak tendency to absorb the energy of precious stones. "Tourmaline" is homophonic with "exorcism" and is regarded as a gem for praying for exorcism.