In general, decorative swords are not intended or designed to be sharpened. They are primarily created for ornamental or display purposes and may lack the necessary construction and steel quality for effective sharpening. Here are a few reasons why sharpening a decorative sword may not be recommended:

1. Blade Construction: Decorative swords often have blades made from low-quality or non-tempered steel. These blades may not possess the necessary hardness and resilience required for holding a sharp edge or withstanding the stress of sharpening.
2. Blade Thickness: Decorative swords may have thicker blades compared to functional swords. This thickness contributes to their structural stability but makes them less suitable for effective sharpening.
3. Blade Shape and Grind: Decorative swords often have decorative etchings, engravings, or other intricate designs on their blades. Attempting to sharpen such a blade can potentially compromise or damage these decorative elements.
4. Safety Concerns: Sharpening a decorative sword without proper knowledge, tools, or experience can be hazardous. It requires expertise to maintain the correct bevel angle, remove material evenly, and achieve a sharp edge without compromising the blade's integrity.

If you have a decorative sword that you wish to sharpen for functional purposes, it is advisable to consult with a professional bladesmith, experienced sharpener, or swordsmith. They can assess the construction and condition of the sword and provide guidance on whether it is suitable for sharpening. If the sword is not designed for sharpening, it is best to consider acquiring a functional sword specifically crafted for that purpose.