To craft this item, combine 1 Iridium Bar with a piece of Cloth at the sewing machine. The most guaranteed way to get Iridium Bars is to create them in a Furnace using 5 Iridium Ore and 1 Coal. The ...
Despite how rare it is, there are actually several sources for Iridium in Stardew Valley you can try depending on your style. Some methods have better odds than others, but also carry greater risks.
The Anvil is equipment that allows you to re-roll the stats of trinkets (except for the Basilisk Paw and Magic Hair Gel). Once crafted, you should interact with the anvil whilst holding a trinket.