As the fruit hasn't yet been shown in the anime, we don't know a lot about its appearance.

This devil fruit allows the user to make their body or anything they touch have malleable qualities of a cloth fabric. These materials become flexible, flat and foldable. This ability is so strong that it even makes metal flutter like a flag at the user's command. The material also retains its characteristics like toughness, strength and sharpness. These metal objects can resist impact from enemies and the blades retain an edge. The user can also fold and reshape flattened things into different forms and shapes. It is still unknown if this ability can be used on humans or any living creature except on himself.

This devil fruit doesn't have its own weaknesses other than the standard devil fruit weakness of not being able to swim.

We can see Diamante using his devil fruit powers for defense when he makes a cape from a steel block and uses it as a shield. This technique allows him to break any incoming sword attacks. When he uses his ability on himself, he can flatten his entire body into a flag, which allows him to float safely when falling.

He also uses his devil fruit ability for combat. He applies his ability onto his rapier and increases the length of his blade and transforms it to an urumi. He can also hide other weapons on his body.

The techniques used by Diamante are:

Lock

In this technique, Diamante undoes his power on something that he had already used his power on to return that thing to its original state.

Corrida Glaive

In this technique, Diamante uses his sword and flattens it to reform and fold in the form of a bull's head, and he uses this to strike his opponents.

Vipera Glaive

In this technique, Diamante flattens the blade of his sword; then the blade extends itself and moves like a snake, and attacks its target.

Army Bandera

In this technique, Diamante makes the ground that he's standing on ripple and flutter. This makes it difficult for anyone standing on the ground to move.

Death Enjambre

This is Diamante's Ultimate technique in which he pulls out several confetti cannons and undoes his ability on them, and then fires them all at once.

Q. What does Hira mean?

A. Hira in Japanese translates to fluttering.

Q. Is there any other meaning for Hira?

A. In Bengali, Hira means ‘diamond’ which fits the name of the current user of the fruit, Diamante.