protected void SpawnGem()
 {
     if (_diamondPrefab != null)
     {
         GameObject gemObj        = Instantiate(_diamondPrefab, transform.position, Quaternion.identity);
         Diamond    diamondScript = gemObj.GetComponent <Diamond>();
         if (diamondScript != null)
         {
             diamondScript.SetValue(_gems);
         }
     }
 }