Celestine is a mineral that can be found while mining in the caves or occasionally in geodes, which are cracked open at the local blacksmith. It presents as a sky-blue crystalline structure and can be sold for a modest price. Additionally, it can be donated to the local museum to contribute to the collection, where it's displayed with a description for visitors to read. Celestine has no other known uses beyond its monetary and educational value.
The item ID for Celestine is 566
This ID will work on PC/Mac (Steam), PS4, PS5, XBOX One, and Nintendo Switch.
Spawning items in Stardew Valley is a little unsual and is not done with commands. You will need to utilize what is called a cheat to set your character's or animal name to the item id. To do this you cannot use just the item id, you will need to surround the item id with brackets. Ex. [566]
Spawning Using the Animal MethodTo spawn Celestine while using an animal, you will need to head over to Marine's Ranch and purchase an animal. Once you have have an animal chosen, name the animal with the item id with brackets like this [566] and you will receive the Celestine item. This method can be done using an existing character and is convenient but will cost some gold every time you want an item.
Spawning Using the Character MethodTo spawn Celestine while using a character, you will need to create a new character and name it with the item id with brackets like this [566]. You will then receive the Celestine item when you speak to a villager. This method is easy and free but cannot be performed on an existing character and you will be stuck with that name unless its edited.