Alchemy Box

This small silver box is encrusted with gemstone filliagry, and features a latch and turning dial on its lid. While the box is closed, you can use an action and turn the dial to cast fabricate targetting a nonmagical substance in the box.

In addition, you can place up to 5,000 gp in the box. While the box is on your person, whenever you cast a spell that requires a material component with a gp value which the spell consumes (such as a diamond or gemstones), you can subtract the component's value from the gp in the box to create the costly component which is then immediately consumed by the spell.