Stardew Valley: How To Do The Multiple Diamond Glitch

This cheat works best when you use multiple Crystalariums. You’ll need a quartz per machine, but they’re pretty common and easy to find, so it shouldn’t be long before you have one.

Put a quartz into each Crystalarium and wait until it’s finished. Each machine should have duplicated another quartz. Go up to them while holding a diamond, and when you grab the new quartz it will enter your inventory as a diamond instead. Do this with multiple Crystalariums and you’ll have tons of diamonds, making cash in no time.