You need a new fishing boat right? Get the kids fluming for gemstones at the Gem Mountain Gemstone Mine. Fluming will have the kids scooping dirt onto a screen and then rinsing it with water. If there are any gemstones on the screen, you'll be able to pick them out by their color.
The people at the mine will inspect your gemstones for free. Then if you want, they'll make them into jewelry for you. But maybe we're getting one step to far ahead. Find them first.