Have you ever wanted to remove a crystal from a piece of equipment without destroying it? It is possible with the Black Spirit Essence or Crystal Extraction Tool:
Black Spirit Essence can be purchased in the Pearl Shop.
The Crystal Extraction Tool can be obtained during certain in-game events.
You will need to visit a Blacksmith to use it. You will not be able to use the Essence/Tool if you extract a crystal through your Black Spirit.
Once you've pressed the "Extraction" button, choose the "Extract Crystal" option":
In the next window, you can select the piece of gear where you wish to extract the crystal from.
Attention: Make sure to place the Black Spirit Essence/Crystal Extraction Tool into the slot next to the "Extract" button. You can do this by dragging it in there or right-clicking it from your Pearl inventory.
The Black Spirit Essence / Crystal Extraction Tool will not be automatically used unless you place it in the slot.
After this, press the "Extract" button and you will find both the crystal and gear intact in your inventory.