Jewels

Jewels are used as a type of currency in this game to buy unique items and upgrades such as islands, parts, clothing, etc. There are many opportunities to earn jewels whether you find them on the map while exploring or win them from the Coliseum.

Where to spend your Jewels
The only places where you can use jewels (not counting the Fishing Pond of Fisherman Island because it's a waste) are Jewel Shops. They have really good items that can't be bought with Gold, including some unique items like fishing rods, Bazaar Island parts, Rental Island parts, etc.

Jewel locations
Other ways to get Jewels:
 * Inside the Hideout house.
 * Fishing Spot 1 in the red chest.
 * Fishing Spot 3 in the red chest.
 * Fishing Spot 4, hidden behind a tree near the entrance.
 * Strange Island, in the red chest that's a bit ahead of the two warpways.
 * In the house located at North Cannon. Where there is also a Dwarf Scout asking to see certain kinds of Denpa Men.
 * In B1F of the Jewel Mine, after falling down a hole located on 1F.
 * In the Jewel Storage of the Snow Village. There are two Jewels once you get inside. You need the Almighty Key to enter.
 * In the basement of each Jewel Shop You can access them easily through the Merchant Relay Point.
 * Jewel Molars drop Jewels as a Rare drop. Can be found in Cave of Darkness 3 3F and Guardian Tower 10F.
 * In the Coliseum, depending on the place you get every week in the ranking.
 * Buying them with real currency from Premium Jewel Shop, but they have limited stock at certain times.
 * As a random drop when Denpa Men come back from exploring Guardian Tower in Exploration Base.
 * Defeating a boss few-enough amount of turns in the Boss Rematch Hall grants a Jewel as a reward.