Conjure Gemstone

You conjure a magical gemstone with the necessary properties to cast any of your spells. This gemstone will disappear after being used as a material to cast a spell (even if the spell does not consume it), this spell ends or you conjure a new gemstone. The gemstone's value will be considered up to 250 gp when used as spell material and can replace any type of gemstone required for your spells.

The gemstone will have the shape of a normal stone and it will be evident that it's real value is 0.

At higher levels. At 5th level, the considered value of the gemstone will increase up to 500 gp, at 11th level, will increase up to 750 gp and at 17th level will increase up to 1000 gp.