Qi Gems arent exactly the easiest currency to earn in Stardew Valley, so players understandably would like to know the best ways to spend them. Qi Gems are a type of currency the player can spend at Mr. Qis Walnut Room on Ginger Island, which opens after they have collected 100 Golden Walnuts. There are 26 items players can buy with their Qi Gems, which vary in both cost and quality.