Exquisite, expensive, and crafted with great meticulousness, products of this kind have one thing in common: for every truly unique item, there are dozens if not hundreds of imitations.
Depending on the professionalism of the person engaging in such activities, this may result in an improperly made item, whose counterfeit can be recognized from afar, or in a top-quality fake that only an experienced expert can distinguish from the original.
It is advisable to keep such a document in a safe place, as you never know if you might want to sell the item in the near or distant future. An indisputable and clear certificate of authenticity will then work in your favor, allowing you to sell the item for a significantly higher amount than initially expected.