Unlike other items or games where you can wear certain items or pieces of armor to boost your experience, there’s nothing you can wear to boost the experience that you are gaining from the tears. The only way you can upgrade the experience boost gained is to complete the Lumbridge Hard Diary, which is a series of tasks that you need to do in and around Lumbridge. Once you have done those tasks, then you will get various rewards and one of those rewards is 10% increased experience from the Tears of Guthix minigame.