How could I make a gameobject move above my players head during an animation and then delete it?

I have a script that plays an animation when walking into an item while also playing a sound effect. How could I make it move above my head and then disappear, like in this image?

You can start a coroutine that activates your gameobject to hold over-head, then wait for the animation clip length. After animation length seconds, you deactivate the item

void GiftPlayer(){
  anim.SetBool("award", true);
  StartCoroutine(HeldItem(diamond)); // starts a coroutine that waits for animation length

IEnumerator HeldItem(GameObject aItem){
  yield return new WaitForSeconds(awardClipLength); // wait for length of animation

Make sure the item is parented to the player, and it will follow your player.