Each Jewel has its own combination recipe, and Gemstone is the key ingredient for Jewel combination.
You can check all of Jewel combination recipes at our website’s combination table section, here are list of Gemstones for Jewel item combination.
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 * Bait Gemstone – Ingredient for Bait Jewel combination
   Low class Bait Gemstone, Middle class Bait Gemstone, High class Bait Gemstone.

 * Nibbling Gemstone – Ingredient for Nibbling Jewel combination
   Low class Nibbling Gemstone, Middle class Nibbling Gemstone

 * SP Gemstone – Ingredient for SP Jewel combination
   Low class SP Gemstone, Middle class SP Gemstone

 * Level Gemstone – Ingredient for Level Jewel combination
   Low class Level Gemstone, Middle class Level Gemstone

? Gemstones can be found by catching fishes from Carp level.
Item dropping rate is much higher in Event type fishes as following, fishes without scroll using will have higher Gemstone dropping rate.
- Gong Fish, Sea Toad, Dark Ghostshark, butterflyfish, Arctic cod, Japanese armorhead, threadfin butterflyfish, striated frogfish)