While a lot of time in Story of Seasons: Friends of Mineral Town is spent working on your farm, you will also be talking to NPCs and trying to make friends. From time to time different villagers will come to you with some requests for help, or perhaps items for sale. Right at the start of your first winter, the Mayor will show you at your house, looking for a diamond. He has talked himself into a corner with the mayor of a nearby town and needs a diamond to show off how great Mineral Town is. This is a bit of a tough one because unless you are pretty well prepared, a diamond is very tough to get. To get a diamond you will need to get to level 20 of the newly opened Lake Mine. When you first start playing the game, you won't be able to access Lake Mine. You will need to wait until the first day of winter when the lake freezes over and you can walk across it. This mine works exactly like Spring Mine. You smash rocks and use your hoe to try and find the ladder to get down to the next level. Unlike Spring Mine, which gives you ores for upgrading tools, lake mine will give you gems and crystals instead. Once you get down to level 20, you will have a chance of getting a diamond. To be able to mind for that long, you will need to bring items that help you recover your stamina as if you leave the mine your progress will reset and you will start at level one again. If you don't have access to any recipes yet, head to the doctor and grab plenty of stamina recovery medicine. If you are lucky, you should be able to make Curry Udon, which is cheap to make at 100 Gold for the wheat flour and curry powder, and it will give you back plenty of stamina. Don't forget, you need to be back at your house by 7 pm to meet up with the Mayor and give him the diamond, so don't be late.