In a fantasy Jianghu game, the resistant gem is aimed at attribute resistance. As long as the resistance is less than the penetration of the opposite side, no matter how big the resistance is, it is equal to 0. In other words, it is only useful if your resistance is higher than the penetration of the opposite side, and making a copy is also useful for monsters, which can block some damage more or less.
In the dream, the Jianghu gems are obtained by buying them directly with copper coins, and then exchanging them with gang tributes in the gang. Then, you have a chance to get them every day. For Wudang, gems need resistant gems, such as qi, sensitivity, body and block.