I must have right clicked an item I was trying to add to the crafting table to shatter it, swapped the item with what I was wearing, and then placed said item I was wearing/crafting on the table to shatter.
This is alpha, I get it. No worries. But, I strongly suggest finding a way to help us avoid this. I had sunk 5 guardian glyphs into it and 8 shards. Was really happy with how the amulet was turning out. Pretty bummed.