What's the ID for lapis lazuli [duplicate]
Solution 1:
According to MinecraftItemIDs.com, the Item ID for lapis lazuli is minecraft:lapis_lazuli. The ID that you would need to use instead of the last one, is minecraft:dye because the version that you are using is 1.12.2.
Here is the command you would want to use to give yourself lapis:
/give @p minecraft:dye 1
You can change the number 1 to whatever number of lapis you want.