There are many useful materials you can find in Dinkum. Some are used to craft extravagant gear while others are meant to be sold for thousands of in-game currency. Opal is a blue, shiny gem in the game that you can sell to John at John's Goods for 15,000 Dinks each.
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Money is a valuable thing. You need a lot to purchase licenses and tools. That's why farming opal gemstones is a great way to make a good chunk of Dinks. These gemstones can be hard to find b there are multiple ways to get them. Below is a detailed guide on how to find opal and what to do once you've found some.
Opal gemstones are cradled within a special rock-like structure called a Thunder Egg. This Thunder Egg only spawns after a big thunderstorm in the game. A normal rainy day won't suffice. You must wait until it's raining cats and dogs and thunder and lighting strike above you. The next day, you will be able to find a Thunder Egg somewhere on your island.
Thunder Eggs make an electrical noise, much like the repairable telecommunications tour near your beach. Listen closely for this noise as you walk around looking for the egg. It looks like an egg-shaped rock and will be buzzing with electricity.
There are two things you can do once you've found the Thunder Egg. You can either crack it open with your axe, revealing the precious opal gemstones inside, or you can take the whole egg to John's Goods and sell it. There are four opal gemstones inside a Thunder Egg.
Alternatively, bring the entire egg to John's Goods to be weighed. You can only weigh Thunder Eggs inside John's upgraded shop. While he is still in the visitor's tent, there is no weighing system. Inside his upgraded shop, to the right, is where you can
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