Each Jewel has its own Ratio rate for combination with fishing rods.
Multiple Jewels can be combined with fishing rods based on our Ratio system
Example : Low class nibbling Jewel(Ratio 25) + High class bait Jewel(Ratio 75) = Ratio limit 100
( + =
This is showing how Ratio system is working with Jewel combining.
Under this Ratio limitation(100), you can combine up to 4 Jewels(with Ratio 25).

Ratio for Jewel type


Low class – Takes up 25 Ratio for Jewel combination  


Middle class - Takes up 50 Ratio for Jewel combination


High class - Takes up 75 Ratio for Jewel combination    

※ When combining, system will deny your trial for same type Jewel or over Ratio limitation.