void BuildJems()
    {
        int jemsY;
        int jemsX;
        int jemCount = 0;
        int jemColourPos = 4;

        do
        {
            //pick a random amount
            jemsY = Random.Range(2,gridHeight -1);
            jemsX = Random.Range(0,gridWidth);
            if(gridPositionType[jemsX,jemsY] == 0)////check to see if its a empty space
            {
                Transform spawnJem = itemSpawnPool.Spawn(diamond,gridPositionArray[jemsX,jemsY],Quaternion.identity) as Transform;///put the jems in

                if(showItems)
                {
                    spawnJem.transform.position = new Vector3(spawnJem.transform.position.x,spawnJem.transform.position.y, showZ);
                }
                else
                {
                    spawnJem.transform.position = new Vector3(spawnJem.transform.position.x,spawnJem.transform.position.y, 0.007f);
                }

                gridObjectRef[jemsX,jemsY] = spawnJem;
                tk2dAnimatedSprite jem = spawnJem.GetComponent<tk2dAnimatedSprite>();
                jem.Play(jemCount);
                gridPositionType[jemsX,jemsY] = jemColourPos;
                jems --;
                jemCount++;
                jemColourPos ++;
            }

        }
        while (jems > 0);
    }