Currently there are four grades, namely four, five, six and seven, but gems of grade four and five are very rare

The quality order is: low grade - medium grade - top grade - top grade - Immortal Grade - Divine Grade

The quality of gems can be improved by the gem inlay administrator. 5 low-grade gems can be combined into a medium-grade gem, 5 medium-grade gems can be combined into a high-grade gem, and so on. Improving quality requires consuming gems to synthesize level talismans, gold, and spiritual power. For example, to synthesize a medium-grade gem, you need a medium-grade gem synthesis talisman.

In addition, in the 45-book treasure farming mode, knocking down the Agni Ancestor has a chance to drop a gem upgrade talisman. Level 6 gems can be directly upgraded to level 7. The quality of the gems after the upgrade remains unchanged: such as 6 After upgrading, low-grade gems will become level 7 low-grade gems. Currently, gem upgrade symbols can only upgrade level 6 gems to level 7 gems.