Problems with for loop to output diamond shape

I am doing this exercise to output a diamond entering a size. I have messed around with this using a odd and a positive and didn't like that way of doing it. So I have been trying to get it to enter the size of the middle of the shape. What is wrong with my for loop it displays it all wrong.

#include <iostream>
#include <iomanip>
 
using namespace std;
 
int main()
{
 
	int size;
 
	cout << "Enter a size of the middle of the diamond: ";
	cin >> size;
	cout << endl;
 
 for (int i = 1; i < size; i = i + 1)
 {
   cout << setw(size);
    for (int j = 0 ; j < i; j++)
     cout << "* ";
       cout << endl;
        --size;
        }
          for (int i = 1; i < 4; i = i + 1)
        {
                cout << setw(size + 2);
                 for (int j = 4 ; j > i; j--)
                  cout << "* ";
                   cout << endl;
                    ++size;
        }
}

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