There are nine Jewels of Truth. Collect them all to reveal a surprise.
1. In the water trough in the stable.
2. In your dog's dog house
3. Exchange 1,000 medals from the horse race (spring 18) for a Jewel of Truth
4. Examine the street lamp between the church and the north entrance to the town square. (thanks to Jessica G. for this)
5. Buy from Won for 50000
6. in the lower right bookshelf on the second floor of the library
7. in the mountain cottages calender
8. the new years game in the town cottage
9. when you have the other eight put them in your rucksack and check Thomas's fridge (thanks to Coxy for th elast 5 locations)